According to the video and screencaps:
Best Male Performance (Rob nominated) will be on act 1.
Looks like Best Kiss (Rob and Kristen nominated) will be on act 5 with Ryan Reynolds and Blake Lively presenting.
The MTV Generation Award (that will go to Reese). According to the video Rob, Chelsea Handler and Patrick Dempsey will present.
The Breaking Dawn trailer is probably MTV Exclusive Clip #3 and will be on act 9. Rob, Kristen and Taylor presenting.
Video | Via | Cap