1) MegaMan. Is there anything Nintendo HASN'T repped in some form for Brawl? Ah, right. Diskun!
Remember! This includes AT's, so Golden Sun, Stafy Densetsu, Balloon Fight (song and fish), etc have already been repped. (Unless he means specifically characters)
2) Mario, Wario, Donkey Kong, Fire Emblem, Zelda, Star Fox, Metroid, Pokemon.
3) Nobody.
4) Ganondorf
5) New minigames, more bosses, less adventuring, better Stage Builder, better online if at all possible, more events, actual KnockOffScreen bosses that aren't playable.
6) Mewtwo, Django (to replace Snake), Sylux
7) None other than Shigesato Itoi :D Let's see how he fares :3