I think sonic looks similar to his form from Sonic 06, only a little shorter. I just watched a trailer for his grand debut in the super smash bros. franchise, and it appears that he is about the same as his latest form; no real difference from Nintendo's version. It also seems that he will have have with him some moves from sonic battle and sonic championship, with his brawl special involving him using his superform and the chaos emeralds, his voice seems to be the one from SA2, but I'm not sure. Sonic's appearance in this game will boost nintendo's sales for the game, but before the game gets sold, there might be some additions of Tails, Shadow, Knux, SuperSonic, or maybe Eggman, but it depends on the opinion of the reviewers. To make it simple, I approve Sonic's appearance 200,000% with two thumbs WAY up!