Hmm Lets see. I'll list every important point I know about this game so far.
1. The primary 'melee' fighting part of the game will require a gamecube controller. Thank goodness. I'm glad that nintendo didn't make us do all the fighting. Other subgames..or 'minigames' might use the wiimote...just to incorporate it somehow.
2. Official character list...SO FAR: Kirby, Mario, Pikachu, Link, Fox, Pit, Metaknight, Snake, Wario, Zero Suit Samus. No one else has been confirmed.
3. According to executive word, SOME players will not return. I'm guessing the redundants won't return, like: Dr. Mario, Pichu, Young Link....just the alternatives to the real characters.
4.There is a separate forum for this game, you guys know?