-Unrevealed newcomers are: Hawlucha, Mii, Pac-Man, Waddle Dee, Palutena, Tom Nook, Prince Sable, NES Ridley, Toad, Paper Mario, Monita, Secret Zelda Character and Secret Xenoblade Character
That would bring the total characters to 54. O_O
-All characters from Brawl return except Pokemon Trainer, because the 3DS can't handle the "API interactive layers" or something.
-To make up for this, Hawlucha, Mewtwo, and Charizard are all playable.
-Mewtwo and Charizard use both their Mega Evolutions that appear to give you a single special attack every 3 kills. You can only use one of the Mega Evolutions, but you pick which one you want.
-Mii uses the user profile's Mii.
-Pac-Man is in his 3D form.
-When playing as Toad, Peach's Neutral Special becomes a mushroom.
-Paper Mario has a fun unique moveset.
-Ridley is playable, but in the classic NES form. Regular Ridley is a boss.
-Brawl clones are still sort of clones, but have been made more unique.
-They have "mix clones" which use moves from two other characters instead of just one.
-Waddle Dee is a mix clone of Kirby and Little Mac
-Tom Nook is a mix clone of Villager and Mii
-Toad is a mix clone of Pichu(?) and Mario
-Monita is a mix clone of Meta Knight and ROB
-There are two secret characters that Nintendo wants to be a surprise, one from Zelda and one from the Xeno series.