It is great to have Rafa in the mix again.
This could be a real cracker if they face each other. If both play, both will be in form, since it will be late into the event likely, so both will have a couple of matches under their belt. Murray does play Nadal pretty hard on hard courts, and while Nadal looks good, Murray hasn't been stagnant either.
This could be a renewed rivalry, and one I hope really picks up.