IMHO the biggest questions are:
a) how many wii U controllers will be possible to use for one system at the same time.
b) what kind of role will the wii - nunchuck combo play for the system.
c) will the wii mote - nunchuck combo receive an update of some sort.
as for b) and c): if they stick to the excisting wii- mote/nunchuck combo (which I think works pretty great and is dead accurate), then they could have the following adavantage: during this gen, they made so many people/families buy the controllers, so that introducing a another completely new Wiimote/nunchuck set would fuck those casual gamers up, and by not doing so, it could be pretty good advertisment by saying "hey, you can still use ur wiimotes" and don't have to buy new sets.
On the other hand, Nintendo probably wants to find a way to sell a lot of controllers again, and if there is really only one U controller per system, and the use of old wiimotes encouraged, then they could make money only from completely new customers who never owned a wii this gen.
one the other hand, if there is no update on the wiimote/nchuck, and they really stick only to the new controller as their MAIN IMPUT method, it would be a step back in terms of comfort and the whole MOTION controls revolution!
AARRRRGH, man, WHAT THE FUCK are they up to???? What are they planning? This whole speculation drives me crazy!
what if they just added a second analog nub to the wii-mote and introduced a super-high-tech ultra-light NEW power glove? (resulting in the ultimate star wars game?)