Activision officially confirmed MW 3 is coming to the Wii.
The move has been expected for a while now and is part of Activision's plan to both expand their userbase and counter EA' Battlefield 3 which is expected to only be on the PC, PS3, and Xbox 360. There is rumors of a Vita version being possible but that probably won't appear until 2012.
Usually the Wii supplies about an extra 1-1.5 million copies to the Call of Duty series when it gets those games.
http://screwattack.com/blogs/ScrewAt...lly-surprising