The new forumstorm on the official site is a video interview from PAX East that suggests the next major landmass addition will be Enedwaith, the area between Eregion and Isengard. No timeline more specific than "later this year."
No, Tharbad isn't in yet. From what I read, there are Dunlendings in the hills and 'savage' fisherfolk along the coast. Those damn Numernorians (Republicians) deforested the area when they first settled there.
The Republican thing was a joke, don't flip out plz.
I'd like to see Tharbad, a overgrown abandoned city, but of course full of a mysterious evil. Would also like to see Saruman's influence in the area and Dunlending stuff.
An overgrown city could be an interesting zone. Think Old Forest maze type maybe. I'd buy that for a dollar.