I wish him good health first and foremost. I hope the knee will not hinder him in any way.
After that I hope he gets a good draw not in the QF, SF or F but in the 1st week. I'm not TOO worried about Rafa in the QF, SF or even F as I am in the first week. I don't expect him to win Wimbledon, Rafa probably doesn't expect it either
As long as Rafa is healthy enough I am a happy fan.