Michael Sheen not the Cheshire Cat

The final casting for the Tim Burton's Alice in Wonderland movie seems to be a big secret. 

Earlier it was rumored that Michael Sheen would play the part of the grinning Cheshire Cat, but now it has been revealed that it is not the case. 

Michael Sheen is still going to be in the film but the part that he will be playing is a secret. Watch this to hear it from Michael himself:

Personally I think Michael Sheen might be quite good in the important role of White Rabbit!

Well, we can't do much more than have a guess. Which part do you think would be best for Michael Sheen?

"Well! I've often seen a cat without a grin; but a grin without a cat! It's the most curious thing I’ve seen in my life!" 

-Alice after seeing the Cheshire Cat