Gamespot is now reporting the same delay. However, according to Gamespot, Ubisoft is delaying the game on the Xbox, to enable "players on Xbox, PlayStation 2, GameCube, and PC to discover [the game] at the same time." Hmm...this hasn't stopped Ubisoft before.
Ubisoft's official Chaos Theory site still lists the game with a "2004" release. I think it's clear that the nice people at Ubi have yet to update the site to reflect the new release date.