Hiddink would be great, he's one of the best, but that's really not going to happen imo.
He was on TV last week where he basically said the only thing that's certain about his future is that he won't be going to the World Cup, because apparently some countries had shown interest in getting him for the WC. He didn't say no to any league in particular but seemed very interested in a managing job at Chelsea, I can't quite recall what kind of role it was, but not Ancelotti's job obviously.
I think he'll end up at Chelsea, since he's got ties with Abramovich.