From the PHP side, this build is focused on various bug fixes and usability improvements (see full list in our issue tracker).
Other changes from IntelliJ platform and web are also included, see complete release notes.
Download PhpStorm 9.5 EAP build 142.4491 for your platform from project EAP page and please report any bugs and feature request to our Issue Tracker. Patch update from the previous version (PhpStorm 9.5 EAP build 142.4289) is already available.
Develop with pleasure!
-JetBrains PhpStorm Team