Symfony 3.2.0-BETA1 has just been released. Here is a list of the most important changes:

feature #19973 Added a default ide file link web view (jeremyFreeAgent)
feature #20285 [TwigBundle] made Twig cache independent of the project root directory (fabpot)
feature #20266 [Console] rename Command::private to Command::hidden (xabbuh)
feature #20270 [PhpUnitBridge] Drop ErrorAssert (nicolas-grekas)
feature #20256 [PhpUnitBridge] Allow configuring removed deps and phpunit versions (nicolas-grekas)
feature #20255 [PhpUnitBridge] Replace ErrorAssert by `@expectedDeprecation` (nicolas-grekas)
feature #20047 [Form] Change FormTypeGuesserChain to accept Traversable (enumag)
feature #19982 [Validator] Allow validating multiple groups in one GroupSequence step (enumag)
feature #19741 [ExpressionLanguage] Making cache PSR6 compliant (Alexandre GESLIN)
feature #20217 [Serializer] Support specifying format for DateTimeNormalizer::denormalize (teohhanhui)
feature #19452 Remove the new SecurityUserValueResolver (weaverryan)
feature #15002 [DoctrineBridge] Add a way to select the repository used by the UniqueEntity validator (ogizanagi)
feature #20113 Use the method map as authoritative list of factories for dumped containers (stof)
feature #19576 [WebProfiler] added support for window.fetch calls in ajax section (ivoba)
feature #19991 [TwigBridge] Added access to token from twig AppVariable (HeahDude)
feature #20029 Hide commands from ApplicationDescriptor, but allow invoking (jwdeitch, Jordan Deitch)
feature #20121 Class existence resource (fabpot)
feature #20119 [TwigBundle] changed the runtime loader to return null if there is no match (fabpot)
feature #20093 Twig extensions refatoring to decouple definitions from implementations (fabpot)
feature #20094 added Twig runtimes for "critical" Twig extensions (fabpot)
feature #20097 [FrameworkBundle] removed the Doctrine Annotations lib dependency on FrameworkBundle (fabpot)
feature #20019 [FrameworkBundle] Add phpstorm ide (hason)
feature #20092 added a Twig runtime loader (fabpot)
feature #20075 [FrameworkBundle] removed the Security Core and Security CSRF component dependencies on FrameworkBundle (fabpot)
feature #20072 [FrameworkBundle] removed the Templating component dependency on FrameworkBundle (fabpot)
feature #20070 [FrameworkBundle] removed the Translation component dependency on FrameworkBundle (fabpot)
feature #20067 [FrameworkBundle] removed the Asset component dependency on FrameworkBundle (fabpot)
feature #20037 [Cache] Handle arbitrary key length when the backend cant using hashing (nicolas-grekas)
feature #20040 [Bridge/PhpUnit] Handle native E_DEPRECATED (nicolas-grekas)
feature #19987 [VarDumper] Use ClassStub for reflected types (nicolas-grekas)
feature #20012 [Translation] added Base Exception for the component. (aitboudad)
feature #19996 removed obsolete images (since 2.2) (fabpot)
feature #19997 inlined some CSS (fabpot)
feature #19304 [Yaml] fix parsing multi-line mapping values (xabbuh)
feature #19191 [DependencyInjection] Automatically detect the definitions class when possible (Ener-Getick)
feature #19745 [Validator] Added context object method callback to choice validator (Peter Bouwdewijn)
feature #19614 [HttpKernel] Use VarDumper in the profiler (wouterj, nicolas-grekas)
feature #19480 [Config] Fix (Yaml|Xml)ReferenceDumper for nested prototypes (ogizanagi)
feature #19681 [DI] Allow injecting ENV parameters at runtime using env(MY_ENV_VAR) (nicolas-grekas)
feature #19197 [Serializer][FrameworkBundle] Add a CSV encoder (dunglas)
feature #19257 [Validator][Choice] Make strict the default option for choice validation (peterrehm)
feature #19326 [Serializer][FrameworkBundle] Add a YAML encoder (dunglas)
feature #19484 [PropertyInfo] Extract the logic converting a php doc to a Type (Ener-Getick)
feature #19495 [master][console] Allow multiple options to be set. (SpacePossum)
feature #19584 [DependencyInjection] Improve ParameterNotFoundException when accessing a nested parameter (wouterj)
feature #19485 [FrameworkBundle] Introduce a cache warmer for Validator based on PhpArrayAdapter (tgalopin)
feature #19790 [FrameworkBundle] add support for prioritizing form type extension tags (dmaicher)
feature #19507 [FrameworkBundle] Introduce a cache warmer for Serializer based on PhpArrayAdapter (tgalopin)
feature #19734 [HttpFoundation] Deprecate extending some methods (Ener-Getick)
feature #19795 Replace count with a given number out of the box (bocharsky-bw)
feature #19807 [FrameworkBundle] Add debug.file_link_format with remapping for IDE links (nicolas-grekas)
feature #19891 [FrameworkBundle] Add cache:pool:clear command (nicolas-grekas)
feature #19900 [FrameworkBundle] Add CachePoolClearerPass for weak cache pool refs in cache clearers (nicolas-grekas)
feature #19570 [Config] Fix YamlReferenceDumper prototyped array support (ogizanagi)
feature #19824 [Console] Add ability to regress the ProgressBar (jameshalsall)
feature #19892 [DI] Add corresponding service id in some exception messages (nicolas-grekas)
feature #19843 [Security] Allow run-time configuration of hash algo (nicolas-grekas)
feature #19894 [Cache] Add "persistent_id" option to RedisAdapter::createConnection() (nicolas-grekas)
feature #19915 [Bridge/PhpUnit] Add bin/simple-phpunit wrapper (=phpunit - yaml - prophecy) (nicolas-grekas)
feature #19826 [VarDumper] Add ClassStub for clickable & shorter PHP identifiers (nicolas-grekas)
feature #19816 [VarDumper] Add LinkStub to create links in HTML dumps (nicolas-grekas)
feature #19768 [VarDumper] Enhance dumping arguments in stack traces (nicolas-grekas)
feature #19796 [VarDumper] Make the line clickable to toggle dumps (nicolas-grekas)
feature #19764 [Config] Add ExprBuilder::ifEmpty() (ogizanagi)
feature #19797 [VarDumper] Handle attributes in Data clones for more semantic dumps (nicolas-grekas)
feature #19755 [VarDumper] Get dump as string with `$dumper->dump(..., true);` (nicolas-grekas)
feature #19604 [Routing] Add seamless support for unicode requirements (nicolas-grekas)
feature #19714 [VarDumper] Handle "title" attribute on virtual properties (nicolas-grekas)
feature #19687 [FrameworkBundle] Use relative paths in templates paths cache (tgalopin)
feature #19339 [WebProfilerBundle][Form][DX] To expand the form nodes that contains children with errors (yceruto)
feature #19519 [Cache] Add PDO + Doctrine DBAL adapter (nicolas-grekas)
feature #19672 [VarDumper] Allow dumping subparts of cloned Data structures (nicolas-grekas)
feature #19657 [VarDumper] Add line in trace indexes (nicolas-grekas)
feature #19639 [Routing] Generate URLs in compliance with PHP_QUERY_RFC3986 (jameshalsall)
feature #19568 [Debug] Better error handling (lyrixx)
feature #19552 [HttpFoundation] Add named constructor on JsonResponse (tyx)
feature #19630 [VarDumper] Enhance dumping __PHP_Incomplete_Class objects (nicolas-grekas)
feature #19515 [Cache] Drop TaggedCacheItemInterface (nicolas-grekas)
feature #19511 Use a dedicated exception in the file locator (leofeyer)
feature #19529 Add Yaml::PARSE_EXCEPTION_ON_DUPLICATE to throw exceptions on duplicates (Alex Pott)
feature #19473 [Security] Expose the required roles in AccessDeniedException (Nicofuma)
feature #19524 [Cache] Add generic TagAwareAdapter wrapper (replaces TagAwareRedisAdapter) (nicolas-grekas)
feature #19504 [Yaml] deprecate missing space after mapping key colon (xabbuh)
feature #19430 [DomCrawler] Add support for XPath expression evaluation (jakzal)
feature #19205 [HttpKernel] Allow bundles to declare classes and annotated classes to compile using patterns (tgalopin)
feature #18533 [FrameworkBundle] Wire PhpArrayAdapter with a new cache warmer for annotations (tgalopin)
feature #17498 [Filesystem] Add a cross-platform readlink method (tgalopin)
feature #19289 [VarDumper] Dumping exceptions is now more compact (nicolas-grekas)
feature #19276 [ClassLoader] Add ClassCollectionLoader::inline() to generate inlined-classes files (nicolas-grekas)
feature #19325 [FrameworkBundle] Allow to specify a domain when updating translations (antograssiot)
feature #19277 [Serializer] Argument objects (theofidry, dunglas)
feature #19322 [HttpFoundation] Add Request::isMethodIdempotent method (dunglas)
feature #17608 [DependencyInjection] Autowiring: add setter injection support (dunglas)
feature #18510 Added a SecurityUserValueResolver for controllers (iltar)
feature #19203 [Bridge/Doctrine] Reset the EM lazy-proxy instead of the EM service (nicolas-grekas)
feature #19236 [FrameworkBundle] Deprecate the service serializer.mapping.cache.doctrine.apc (Ener-Getick)
feature #19174 [FrameworkBundle] Show server:run logs by default (nicolas-grekas)
feature #19137 [Serializer] Allow to use easily static constructors (Ener-Getick)
feature #19146 [DependencyInjection] deprecate access to private shared services. (hhamon)
feature #19190 [DependencyInjection] Add support for short services configurators syntax (voronkovich)
feature #18823 [Cache] Add PhpArrayAdapter to use shared memory on PHP 7.0 (tgalopin)
feature #18948 [VarDumper] Add maxDepth & maxStringLength display options (MGDSoft, nicolas-grekas)
feature #18626 [Yaml] Added support for parsing PHP constants (HeahDude)
feature #19104 Adds support for the SameSite attribute in cookies. (iangcarroll)
feature #19153 [Validator] support egulias/email-validator 2.x (xabbuh)
feature #11394 [Routing] support for array values in route defaults (xabbuh)
feature #11882 [Workflow] Introducing the workflow component (fabpot, lyrixx)
feature #19151 [VarDumper] Add support for XmlReader objects (Taluu)
feature #18471 [Console] Add Lockable trait (geoffrey-brier)
feature #19139 [FrameworkBundle][Yaml] Move YamlLintCommand to the Yaml component (chalasr)
feature #19143 Response headers fix (fabpot)
feature #16809 [Form][FrameworkBundle][Bridge] Add a DateInterval form type (MisatoTremor)
feature #18466 [Bridge][Twig] Optionally pass dumper into DumpExtension (CarsonF)
feature #18022 [DependencyInjection] Sort the CompilerPass by priority (Ener-Getick)
feature #19090 [Console] Add ConsoleLogger::hasErrored() (nicolas-grekas)
feature #19079 [Debug] Do not quote numbers in stack trace (c960657)
feature #19012 [Console] progress bar fix (TomasVotruba, fabpot)
feature #19047 [Cache] Add tags based invalidation + TagAwareRedisAdapter (nicolas-grekas)
feature #17644 Deprecate using Form::isValid() with an unsubmitted form (Ener-Getick)
feature #12979 [Router] added appending of new optional document fragment (rodnaph)
feature #18710 [Console] Simplify simulation of user inputs in CommandTester (chalasr)
feature #18999 [Console] Centralize input stream in base Input class (chalasr)
feature #19060 [ExpressionLanguage] Add a way to hook on each node when dumping the AST (nicolas-grekas)
feature #18880 [PhpUnitBridge] add a triggered errors assertion helper (xabbuh)
feature #16906 [Console] Better support for one command app (lyrixx)
feature #17203 Move Constraint validator test case to Test namespace (WouterJ)
feature #18502 [FrameworkBundle] Add file helper to Controller (dfridrich)
feature #19053 [Process] Allow inheriting env vars instead of replacing them (nicolas-grekas)
feature #18833 [HttpKernel] Move duplicated logic from Esi/Ssi to an AbstractSurrogate (chalasr)
feature #18220 Don't send default cache header for 301 redirects (e-moe)
feature #17662 [Translation][transChoice] allows escaping the pipe character. (aitboudad)
feature #18322 [DomCrawler] Attach label to form fields (carlosV2)
feature #18482 Created a trait to sort tagged services (iltar)
feature #15458 [Filesystem] Add feature to create hardlinks for files (andrerom)
feature #18940 [Console] Add path argument to dump a specific option in debug:config (chalasr)
feature #19013 [ExpressionLanguage] Added a way to dump the AST (lyrixx)
feature #18332 [Form] added `CallbackChoiceLoader` and refactored ChoiceType's children (HeahDude)
feature #18869 [Routing] Throw exception when PHP start tag is missing (WouterJ)
feature #18781 [Console] Display errors in quiet mode (multi-io)
feature #19011 [HttpKernel] Add convenient method ArgumentResolver:: getDefaultArgumentValueResolvers (romainneutron)
feature #18977 [PropertyAccess] Add missing arguments to PropertyAccess::createPropertyAccessor() (chalasr)
feature #18568 [WebProfilerBundle] Fix bundle usage in Content-Security-Policy context without unsafe-inline (romainneutron)
feature #16838 [PropertyAccess] Add PSR-6 cache (dunglas)
feature #18790 [Console] Show aliases in command description instead of in different lines in application description (juanmirod)
feature #18728 deprecate get() for uncompiled container builders (xabbuh)
feature #18483 [Serializer] Deprecate SerializerAwareEncoder (JhonnyL)
feature #18337 [PropertyInfo] Support singular adder and remover (dunglas)
feature #18894 [Cache] Added PhpFilesAdapter (trakos, nicolas-grekas)
feature #18964 [PhpUnitBridge] Make DnsMock match namespaces that begin with Tests\ (teohhanhui)
feature #18726 [PhpUnitBridge] Make ClockMock match namespaces that begin with Tests\ (teohhanhui)
feature #18825 [Cache] Create NullAdapter to disable cache if needed (tgalopin)
feature #18675 [VarDumper] Add Redis caster (nicolas-grekas)
feature #18785 [Yaml] deprecate comma separators in floats (xabbuh)
feature #18486 [Yaml] Allow using _ in some numeric notations (Taluu)

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