The latest (and last in the series) Release Candidate for PHP 7 has been released as mentioned on php.net today. This is a development preview release only and is not intended to be used in production.

The PHP development team announces the immediate availability of PHP 7.0.0 RC 8. This is the thirteenth 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 8 contains fixes for 11 reported bugs.

This release fixes several final bugs that were preventing the final stable release of PHP 7.0.0, some relatively major. You can download this latest release from either the QA download page or from the Windows QA site. If you're interested in what's changing in this release (and in PHP 7 overall) check out the NEWS file.