User blog comment:Shan the Hedgehog/Level List, A Few Characters, Bosses, DLC, And More Confirmed For Sonic Generations/@comment-3295259-20110624182243/@comment-477304-20110624184446

Well Some of the other icons have something to do with past games, the only thing that comes to mind is Knuckles' Chaotix, where there was a monitor that changes the partner character (It might be main character as well depending on who hits it, I forget). But that seems unlikely