So there's been major leaks over the internet with video from the Subspace Emissary Mode.
Luigi confirmed
Captain Falcon confirmed
Game & Watch confirmed
Ganondorf confirmed
Jigglypuff confirmed
Falco confirmed
Ness confirmed
Lucario confirmed
Toon Link (Wind Waker style) confirmed
Marth confirmed
R.O.B. (the robot guy...thing) confirmed
apparently the last unlockable character is Wolf from the Star Fox games rounding the roster out to 35 members.
Young Link has become Toon Link. Roy, Pichu, Dr. Mario, and Mewtwo have been cut.