Yeah here is the list of newcoming characters so far:
Pit from Kid Icarus
Wario from Mario game series
Zero suit Samus from Metroid series
Ike from Fire Emblem
Pokemon Trainer from Fire Red and Leaf Green Pokemon versions.
Diddy Kong from Donkey Kong series
Meta-Knight from Kirby series
Snake from some sort of shooting/military spy game (I don't know exactly
Lucas from the Japan only game, Mother 3
and lastly (drumroll please)....Sonic from the Sonic the Hedgehog series who makes his long awaited Smash appearance!