What I am expecting from Microsoft is a release date and a new trailer from Quantum Break, Fable Legends and Halo 5. Those are their big guns for next year, we need to see more about those.
We won't get any new major announcements for 2015 games. Not at the TGA, and most likely not even at E3 2015. When Microsoft announced games like Scalebound, Phantom Dust, or Crackdown back in June 2014 - project that are obviously in early stages of development, and most likely won't see a release before 2016, some don't even have a real name or a dev yet - they also showed their hand...
At this point, I think we have most of the exclusive line up for next year. State of Decay: Xbox One Edition and ScreamRide for a slow first half of the year. Fable Legends, Halo 5, Quantum Break, and Forza 6 for a big holiday season. This asymmetric planning is really typical of Microsoft.