Well, Nintendo has said that they will be holding back on guest characters, but they also said that they were interested in getting some Capcom guest characters... idk why specifically Capcom, but who cares. Gimme Arthur! Or Mega Man. Mega Man works, too.

Oooh, that would mean we might get Capcom assist trophies... Omg I would do anything to summon up the fighter plane from 1992 to gun down my enemies >: D