Since Sega dosen't want to respond to Nintendo about Sonic being in Brawl this leaves room for Megaman from Capcom, but the Question is which vesion of Megaman should be in the game.
the original mega man(NES)
mega man x(SNES series)
mega man dash/trigger(ps series)
mega man.exe(gba series)
zero(mega man)(gba series)
the mega man zx(which is the one you'll see in the up coming mega man game on the ds.) Here's a better pic of the DS mega Man