Just to clarify something that people seem to be over looking this is the compleat list of MGS first party titles (excluding XBLA) for the 360
Halo 3, Halo: ODST, Halo: Reach (Bungie)
Halo Wars (Ensemble)
Forza 2, Forza 3 (Turn 10)
Kinect Sports, Viva Pinata, Viva Pinata: Trouble in Paradise, Perfect Dark Zero, Kameo: Elements of Power, Banjo-Kazooie: Nuts & Bolts (Rare)
Kinect Adventures (Good Science)
Kinect Joy Ride (BigPark)
Fable 2, Fable 3 (Lionhead)
Thats 15 titles over just over 5 years so on average 3 titles per year, and that is including 2010 which was Microsofts biggest ever year in terms of quantity with 5 titles. There is no big list of core games coming from first party but they also haven't been cuting back (other than Ensemble, though you could argue Rare, Bungie was replaced by 343) they have 3 studios working on core titles and 3 on Kinect only one of which was an existing studio Rare also has been their least "core" developer with most of their games being kid freindly anyway.
So there are 3 core developers 343 is making Halo but they are new and Halo game have been on a 3 year cycle so 2012 will probably be when that is released (Halo remake according to rumors is made by a third party), Lionhead put out a game last year and are putting out a PC port this year and there have been 2 year gaps between games for them so again 2012 for their next big game at the soonest, Turn 10 are putting out a game this year.
I don't see where the mistery is we know what all their studios are working on and only one core game looks to be coming this year but we may well see 2 next year. We will most likely see 3 new first party Kinect games as well 2 of which are from new studios set up just to make kinect games.
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