He's going to do the prequels, but not until after ROTJ:R. So we won't be seeing any PT:R for quite a while, I'd say - probably not until 2013 or 2014. Which means he probably won't be done with the whole "saga" until 2020-ish.
I'm interested to see what he's going to do with them, but I don't really care too much, to be honest. I don't think they can be made into films worthy of the Star Wars name, no matter who's fixing them.
But hey, if anyone can do it, Adywan can, right?