To prevent any forum cluttering, let's put every detail we know about the game in this thread (I request a temporary sticky). So far, we know the playable characters are Sonic, Tails, Knuckles, Amy, Shadow, Rouge, Omega, and Cream. That's right, Cream is one of the characters. How you're actually going to beat things up with her is a mystery I'll never know (unless she's the designated medic). Game play seems to be in the vein of Mario and Luigi.