The Xbox 360 version of World in Conflict will have to wait until next year, according to the Sierra Entertainment press release. This "port" was scheduled for this Autumn but it will have to wait for the next year.
The console port is developed by Swordfish Studios under the close supervision of the PC developer Massive Entertainment. Beside the most common changes to fit the Xbox 360, Swordfish is remapping the controls and creating a new HUD.
The PC version of the game was released on September 19th.