EDIT: Bah. Tried to embed the trailer with Mega Man, with little success. Here it is.
Anyway.
To hell with a balanced roster, I hope the Metal Blade is every bit as overpowered as it deserves to be.
Still. The Villager from Animal Crossing? I get that the first part of the trailer was meant to mislead anyone silly enought to think that Nintendo wouldn't reveal Super Smash Brothers at this ND, but when Brawl debuted we got, what, Meta Knight, Pit, Samus-in-spandex, Wario and Solid Snake, if I remember correctly. I would've appreciated at least one other new challenger.
Regardless, looks bloody great. I'm a lot closer to buying a Wii U than I was half an hour ago.