SSMB is basically an advert of games for Nintendo, anyway. The only reason Snake was included was due to that gamecube remake of MGS. Now the new "stars" to celebrate is Sonic, thanks to the exclusive deal and Bayonetta. So they probably will appear as the new guest characters replacing previous ones. if it does pan out this way and the fighter roster is usually made up of nintendo characters who always had that kiddy/family appeal, it makes you wonder why sega can't put their more "mature" characters in an ALLSTAR game.