This.
Best I can guess is that they will focus on stuff for this year.
maybe...
15 min Halo section
10 min. TR gameplay video
7 min Forza gameplay reveal
4 min on gears remastered
7 mins on new Rare game
3 mins on new Twisted Pixel game
3 mins on new press play game
3 mins on gears 4 teaser +info
10 mins showing off new Win 10 UI
7 min showing off various Indy games
21 min showing off various 3rd party games
And there you go. That would make 90 minutes....it goes by fast