The main php.net site has officially posted the latest release candidate version for the upcoming PHP 7 version: Release Candidate 4. It's now available for download and testing.

The PHP development team announces the immediate availability of PHP 7.0.0 RC 4. This is the ninth pre-release of the new PHP 7 major series. All users of PHP are encouraged to test this version carefully, and report any bugs and incompatibilities in the bug tracking system. [...] PHP 7.0.0 RC 4 contains fixes for 22 reported bugs and over 100 commits with various improvements.

As always, you can download this latest pre-release version for testing from the QA downloads page or windows.php.net/qa for the Windows binaries. If you're interested in the full list of changes, check out the NEWS file for updates.