MS: Halo in Fall. I don't remember much of fa boost from Gears2 so, not sure what that will do. I don't expect much from NATAL. Not a game announced.
SONY: GT5 in Summer [Spring for Japan]. Huge amount of exclusives in Q1 and 2. Expect a few announced games with no release windows set yet in the later half of the year. PSWand actually has a few announced titles. Nothing major but a few familiar names like Ape Escape.
4 ≈ One