well if you're talking about gamescom MS really didn't reveal anything new,they just showed off Halo:Reach, talked and demonstrated Kinect, talked about windows phone 7(or whatever it is) and show games already announced. MS did announce a new game called "flight" and another called "Age of empires"
frankly(and I hope I don't strike a nerve) but MS's gamescom conference was more bland than E3(IMO)
here's some info:
http://www.microsoft.com/presspass/features/2010/aug10/08-16winphonegames.mspx
http://www.microsoft.com/emea/presscentre/pressreleases/MicrosoftatGamescom_20100817.mspx
http://www.videogamesblogger.com/2010/08/17/microsoft-gamescom-2010-conference-kinect-releases-across-europe-november-10-2010-age-of-empires-online-and-microsoft-flight-announced-windows-mobile-7-games-to-be-shown.htm
just google Microsoft's gamescom conference 2010, you'll find something
EDIT: I just heard stuff here and there from around the net, MS is bound to give more information for games/announcements in the next few days
