Optional "XP mode" in Windows 7 is probably going to disappoint a lot of people. It seems obvious that the target is business users trying to keep old applications running under Win7, rather than any sort of gamers.

It will take time for games to be developed and redeveloped for Vista/7, and in the meantime we have XP fading into the rear view mirror. My guess would be that Microsoft's answer to gamers is to buy an Xbox instead.