Well there was
this thread that was started a while ago, but it doesn't appear to have been active for at least a month... It's a cool idea, but in my own personal opinion I don't see the point. Yeah it would be cool to play as them in brawl, but why not just buy the new smash game? I feel that brawl is brawl and wii u is wii u. That's just my thoughts... Although I do think a Greninja PSA would be cool.