PHP Develpment Tools 3.7.0 will improve PHP7 support. It also continue improvements on performance, usability and consistency.
The PDT source code is contained in the org.eclipse.pdt.git repo and for this release is tagged R3_7_0.
The PDT provides it's own update site with all features included. For 3.7, this site is located at http://download.eclipse.org/tools/pdt/updates/3.7