I just finished watching my DVR's recording of the match. To be honest, I expected much tougher match for Rafa. He was surprisingly solid on both wings, the serve was good (not great), the movement - excellent. Federer on the other hand made many mistakes and rushed the net a lot more than in their previous meetings. Rafa hit some spectacular passing shots and some incredible gets. Also, I don't think Federer was serving as well as in his match against Murray (and Murray , IMO, is a better returner than Rafa).
So, I am not sure what to expect from the final. Wawrinka has been serving bombs and Rafa's returns have been pretty shaky the whole tournament. Also, Wawrinka's backhand is better and more sloid/less error-prone than the backhands of Dimitrov and Federer. I believe he will win at least a set, maybe even 2 or 3 if Rafa doesn't take good care of his own serve.