What I can't do for now:
* Switch VT - I can't switch back to X after that
* Use Compiz/3D apps - X crashes right after starting compiz/glxgears - #427643
* Exit X/Logout - X could not restart
All problem above resulted in a total lockup from physical access. Box still responding through network.
For others, everything works fine like usual (at least for my purposes, and of course, the versions are newer than F8 versions).