I see Alonso as the man to beat. So long as he has a strong car I think that will be tough.
Looking forward to seeing what Schumi can do but I think by he time he gets his chops back and they make the car competetive with the top, the others may be too far ahead.
I agree Button's only skill was being on Brawn last year...
Hamilton, Vettel and Massa will be fighting it out quite a bit - Vettel is a future World Champion.