Some phasing is up for Durotar (Razor Hill), Orgrimmar (Troll district taken over by Kor'kron) and certain areas of the Barrens (floating rocks?). Over in Pandaria you've got a fair amount of GARROSHNESS and general defilery around the Shrines.
One question I have: what will these new areas be used for (gameplay-wise), specifically the Barrens. Very interested in the red X's; possible one-time quests, elite mobs or scenario tie-ins?