Yeah, more or less. The Horde and Alliance are pretty much waging some sort of low-level war thingy. The Orcs have established the nation of Durotar, with Ogrimmar as the capital, which is where the Trolls are also based out of. The Alliance still has Theramore on Kalimdor, and the Orcs have their own outpost in southern Azeroth.
Whats left of the Humans in Azeroth is basically Stormwind and the surrounding territories. the 10 year old king, Anduin Wryn, runs the place, though the surrounding lands are being threatened by all sorts of beasties and Storminwind doesn't have the man-power to deal with it. Oh, and the Dwarven King built a subway linking Ironforge and Stormwind after the war, so there're also that.
Sylanas Windrunner sort of split off from Arthas' rule, and now runs her own Undead kingdom based out of the ruins of Lordaeron (the Undercity being built under the old human capital).
This is all from WoW, which I think takes places 4 years after the Frozen Throne. And mysteriously, not a peep out of Arthas or his legions.
