I would imagine so. I Wii U is a relatively new 4th Gen console in which most game developers are keen to expand to, although i dont own one, has the recent Black Ops II DLC reached the Wii U?
No, but that was Treyarch and this is Infinity Ward. Besides, if they are releasing it on all platforms, why skip the WiiU?
Who knows.. it might not even release on the U.