I have predicted also on this forum event by event what I think Rogie will do in 2013. My belief is that Rogie will lose to Murray in the SF (first loss to Murray in a grand slam and I'm assuming they'll be in the same half, with Rafa and Djokovic in the other half). Of course I'm also assuming in the first 2 weeks of January that Rafa and Ferrer don't flip-flop positions at #4 and #5, or otherwise one the top players would, gulp, have to face Rafa in the QF.
They can't. it's just not possible. Nadal is confirmed as #4 seed provided noone withdraws.
I believe he'll make the SF. I hope he'll draw Nadal, who I don't think will make the SF in his first major after a six month layoff. Could be a good chance for the final. We'll see when the time comes