Don't forget the Wiiware version of Super Meat Boy.
All in all, it sounds decent for now. The second half of the year is always a mystery; Goldeneye, Wii Party, Kirby, and Donkey Kong were all announced just a few months before release this year alone. I could imagine the first half of the year being very slow, though that might be overshadowed by the 3DS.
Is it confirmed WiiWare? I read somewhere that they were having trouble cutting it down to fit the size restriction, and were comtemplating a release on disc, with some extras.
No, but dammit, it was announced for WiiWare first. A disc release would be fine too.