the majority of wii games will use the nunchuck setup.
there will be no alternate setups for use with cube controllers on games.
if all you play is madden, what change are you looking forward to every year? new rosters? EA could have EASILY made them downloadable year to year. Madden needs a change, now that EA has no competition til 5 years from now, one cant expect much from madden, or EA football. the only change will be a new control scheme, and thats not enough for that franchise anyway.
The whole idea behind the wii IS the new controller. if its the one thing that turns you off, i cannot recommend it. a nice thought though: nintendo wants to pick up non-gamers, which means you will be able to play many of these games at retailers and stores before you make a decision.
EDIT: Joining this forum is proof that youre interested, have you joined ps3 forums too? if so, im sorry.