On the PHP.net site a new announcement has been posted about the release of PHP 5.6.0RC1, the first release candidate in the PHP 5.6.0 series.

The PHP development team announces the immediate availability of the first release candidate of PHP 5.6. As we entered the feature freeze with beta1, this is a bugfix-only release. All users of PHP are encouraged to test this version carefully, and report any bugs in the bug tracking system.

As this is a release candidate, it is not valid for production use but any testing that can be done is appreciated. There's several new features coming in PHP 5.6 including constant scalar expressions, variadic functions, argument unpacking, "use const"/"use func" and many more. Check out this page in the manual for full details and code example of each. As always, you can download this preview release from the QA downloads page or here for the Windows binaries.