Oblivion86 on 07 January 2011
Let's see this list is horribly flawed and I definitely wouldn't believe half the stuff on wiki..
Crytek (6 years partnership with MS - I would take this one over any 1st party on the PS3)
Firebird
Epic (will be acquired before Gears is released)
Remedy (will be acquired before Alan Wake is announced)
343
Mistwalker
THQ (working on 2 exclusives for 360 currently)
Rare (working on AAA exclusive for core audience)
Lionhead
Turn 10
2K Marin (currently doing XCOM)
Ruffian
plenty of unannounced information, MS will be loaded in 2011-12 mark my words..
