According to this post on Reddit.com (and this NEWS file update) the latest beta of PHP 7.0.0, beta 2, has officially been tagged.

Fixes include updates in several different areas of the codebase:

• Curl
• GD (graphics handling)
• Opcache
• SOAP
• the SPL (Standard PHP Library, with MutlitpleIterator)

You can find out more about all of the bugs that were fixed (including a sneak peek at what's coming in beta 3) in the NEWS file.