According to this article at a Taiwanese gaming news (machine translation), though I'm not entirely sure about the text of this article, it seems Microsoft in Taiwan announced Xbox 2 supporters (a bit?) earlier than others The list is
Since it was Microsoft Taiwan that leaked the news of Sakaguchi of MistWalker before, this new info has some credibility, I presume.
... and some more are expected apparently.3rd parties:
spring international limited liability company
third wave information limited liability company
2KGames
Activision Inc.
Atari Inc. (English valuable standard)
Bandai Co. Ltd.
Bethesda Softworks LLC
Capcom Co. Ltd.
Codemasters Software Company Ltd.
Eidos Inc.
Electronic Arts Inc. (Beautiful business skill electricity)
FromSoftware Inc.
KOEI Co. Ltd.
Konami
LucasArts
Majesco Entertainment
Midway Games Inc.
Namco Hometek Inc.
Phantagram Co. Ltd.
Rockstar Games
Sega of America Inc.
Tecmo Inc.
THQ Inc.
Ubisoft Entertainment
Vivendi Universal Games Inc.
Webzen Inc. (Net imperial sacrifices)
1st/2nd parties:
BioWare Corp.
Bizarre Creations Ltd.
Bungie Studios
Epic Games Inc.
FASA Studio
Game Republic Inc.
Lionhead Studios Ltd.
Mistwalker
Q Entertainment Inc.
Rare Ltd.
Real Time Worlds
Since it was Microsoft Taiwan that leaked the news of Sakaguchi of MistWalker before, this new info has some credibility, I presume.