I cant wait to see Fedor in the cage. Mirko made the mistake of not training in a card prior to fighting in UFC. Bad idea. But Fedor is an entity of unstoppableness. I dont think a cage will phase him.
Unfortunately for Rogers and every other heavyweight, i think Fedors style should translate extremly well to the cage. It will be a lot easier for him to stock people and trap them in a cage then it is in a ring. People will have no where to hide from that ridiculous ground N pound of his when they hit the mat, no diving through the ropes this time.