Call of Duty 3 hit the Wii during the launch however, the fourth iteration in the game missed all but the PS3 and Xbox 360. However with Treyarch in the helm of the next game (they take turns with the original Call of Duty Developers, Infinity Ward). The game will be making its return to Wii, as well as the PC, Wii, Nintendo DS, PS2, PS3 and Xbox 360. Also while not confirmed, its rumoured that the story, despite moving to Modern Times in CoD4 will return to World War II, but will have more focus on the Pacific Campaign of the war rather than the well-worn Western European angle.
Source: Wired