I want to see Danath get a new model.
It does make sense to focus on the old world more than ever with Allied races being such a big deal now as well as the faction conflict being so important now too.
I know Blizz and even a lot of players probably don't want another full expansion based on re-designing the world but I think Blizz could update a handful of zones every expansion from now on till eventually they are all done. I'm tired of all the Twilight's hammer shit and all the destroyed zones I used to love questing in.