As announced yesterday, we have just released Symfony 2.3.0 Beta 1.

If you want to help us, please, test this version on your existing projects or play with it on a new one:

Create a new project via Composer:

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        $ php composer.phar create-project symfony/framework-standard-edition somewhere/ 2.3.0-BETA1
    

Download a ready-made project based on the Standard Edition TGZ or ZIP;
Download some components via Github downloads: https://github.com/symfony/{COMPONENT_NAME}/archive/v2.3.0-BETA1.zip.

If you want to update an existing project, update the dependencies in the composer.json file according to the versions found in the composer.json file from the Symfony Standard Edition and then follow the upgrade instructions (for Symfony.

If you are only using some of the Symfony components, just update the versions of these components in your composer.json file.

There are a few additional things I want to mention about the Symfony Standard Edition.

The Symfony Standard Edition now only depends on MIT/BSD licensed libraries and bundles (Swiftmailer recently changed its license to MIT). If you are using the JMSDiExtraBundle or JMSSecurityExtraBundle bundles, you can still use them by manually updating your composer file (see the commit that removed them).
The Symfony Standard Edition repository does not come with a composer.lock file anymore. This was mainly done because Composer installs a different version of the symfony/Icu component depending on your PHP configuration. But anyway, as the Standard Edition is a generic application, it is better to not lock out some specific versions.

And don't forget to report any issues you might find.