Shritistrang
Smash Journeyman
That would be nice indeed.I expect many, many bosses. At least two from each major franchise. So I don't think every boss will be playable.
Mario: Petey Piranha & Mouser
Zelda: Gohma & Great Moblin
Metroid: Kraid & Mother Brain
Kirby: Kracko & Dark Matter
Starfox: Aparoid Moth & Andross
Donkey Kong: King Zing & Army Dillo
Pokémon: Gyarados & Skarmory
Don't ask me about Kid Icarus and Fire Emblem, though...