1) Which maps they will include, and how they will alter them
a) Definitely in: Bog, Countdown, Shipment, Showdown, Wetwork, Vacant

Possibly in: Crash, Ambush, Backlot, Chinatown, Bloc, Crossfire
c) I doubt it: Broadcast, Creek, District, Downpour, Overgrown, Pipeline, Strike
2) I'm guessing that once again only kill/headshot challenges will be available, since the wii apparently can't handle situation defendant challenges. Camo, yay!
3) Game modes. I am guessing that they will stick with the WaWii formula of TDM and FFA w/ **** options. HQ seems the most likely additional game mode to me, simplest mode for the wii to handle.
4) WaWii invite system and 8 player max? Hope says they improve this, reality says they won't spend the money/man hours to improve these areas.
5) Any fundamental game changes? Smoke nades will probably be out or altered, since the wii can't handle it. Helicopters seem awfully complicated for the wii to handle...but maybe they can pull it off. Frag x3? Doubt they will "fix" that, lol. I also randomly wonder if they will fix the melee glitch of the silenced G3.
6) Aim assist. WaWii had an absurdly strong aim assist. Because MW weapons are significantly more accurate at distance, I would pray they dial it down a notch. It will turn into a camp fest if not, because everybody would be deadly when ADS.