Dunno why so many people feel it necessary to come in just to say that they're not interested. Plenty of people obviously are. If you're not one o them, move on.
Anyway, I'm guessing there will be a new character, and probably a couple of echoes. Gonna predict Spring Man, Dixie (echo), and Ms. Pac Man.
There's so many echo fighters they can choose it's crazy. I'm hoping for a Pokemon Trainer one. I don't know which generation character they would use but it would be awesome.