Effects Masking and Tracking within Premiere Pro sounds like an awesome addition, as are Master Clip effects, which will make color correction a breeze.
As for SpeedGrade the direct link to Premiere Pro feature where you actually open your timeline in SpeedGrade would seem to answer about half of my issues with SpeedGrade. Now they just need to get some curves going in there.
The ability to apply filters per mask in a layer will greatly speed up effects, and simplify timelines. And the Live templates features is very very cool. Where you can set text lines in After Effects to be editable by an editor within Premiere to quickly make lower thirds and the like based on a graphical template.
All in all it sounds great, and I hope the download is available soon!