I agree Isabel, I'd be very surprised if Federer wins the AO. The courts are quite slow and high bouncing which spells trouble for his backhand, especially if he faces Rafa. He also would struggle to play very aggressive tennis there as defensive players like Andy/Novak/Rafa would keep on returning his shots.
Fed's played very well during the last few weeks but I think the level Andy showed in the Asian swing was higher - there he had just the right mix of defense and aggression. If he can keep that level and control his nerves in the big matches then he's got a really good chance of winning the AO himself.