I would hope for an Kalimdor/EK revamp. It feels silly to me for it to be time locked in Cataclysm only for it to then force the player back in time and then forward in time again, and then back again, etc. It's stupid...
The 1-60 leveling zones, IMO, should be designed in such a way that you don't really know what time period they are going on in, like how the zones from vanilla behaved during the following expansions, they were just sort of ambiguous.