Long story short: in the coming months, the Symfony core contributors should focus their efforts toward stabilizing the existing features instead of working on new ones. At this point, backward compatibility and stability are more important than everything else.

He highlights some of the points that come along with this effort including less refactoring for the sake of refactoring, fixing more bugs/edge cases and writing more tests/documentation. He gets into some of the specifics of this kind of thinking and points out the things that can and can't be changed during this time. He talks more about stability and suggests that not only can it help enhance performance but it could also help motivate more projects/corporate users to start using the framework.

Via the ISV Initiative, NuSphere will make its flagship product, PhpED, which is an award-winning PHP Integrated Development Environment (PHP IDE) favored for its power, speed, ease of use, exceptional PHP debugging capabilities, and fully configurable user interface, available to the Mac and Linux communities through use of Parallels desktop virtualization products, which include Parallels Desktop 3.0 for Mac and Parallels Workstation 2.2 for Windows and Linux.

The collaboration between the two is bringing one of the more popular PHP IDEs over to the Mac world in one of the first steps the Paralleles Group has made to bridge the gap between Windows and OS X.

Check out some of Joseph Crawford's thoughts on the collaboration too.