So... wow, the stupid Galaxian is actually part of Pac-Man's moveset. I certainly never expected that. Regardless, at least its classic Pac-Man. But guys, I'm pretty sure now that we have all our Retro characters. Even if you don't count Little Mac, Pac-Man and Mega Man are clearly Retro. They're based entirely on the classics. We don't have a Nintendo Retro character, but at this point, I think Nintendo is trying to add recent characters to maximize sales.
We might get a few older characters, but probably not many. (I just hope Isaac is one of them.)