DoA4 is close enough to be considered a Jan 06 release due on a technicality that most stores didn't receive the game until Jan anayway!
There aren't any systems anyway to buy.
March/April is starting to look jam packed for 360. I think many of these delays are kicking in due to lack of consoles available. Perhaps we can thank MS for the shortage, as it is making publishers push back games and help improve the quality while waiting for more systems to trickle in.