PHP 7.0.15 RC1 was just released and can be downloaded from:

The Windows binaries are available at

This release contains a number of bugfixes.
For the list of bugfixes that you can target in your testing, please refer
to the NEWS file:

Please test it carefully, and report any bugs in the bug system.

The stable release is planned for January 19th, if no critical issues will
be discovered in the RC.