I found this rumor image here. And while it’s from 4chan, and I understand that it could very well be fake. I’d be just fine with this if it’s true. I think some things like especially Mewtwo showing up in his X and Y form (I actually never realized that actually helps him on a path to returning to SSB) and the opening being an homage to Melee’s opening.

Also I’d be super happy to have early confirmation of Sonic’s return even if that was pretty obvious. Don’t know how the internet would take if Pac-Man really is a character though. But I actually wouldn’t be too surprised because Namco is working with Nintendo on this one.