Originally Posted by
Tomec
I'm not a huge lore buff, and am not in the beta, but lore wise wasn't his home/lair basically Deepholme for the last umpteen billion years or whatever? He was slumbering there, getting driven insane by the old gods' whispering in his head or something, and us killing his kids didn't help any. Supposedly in the beta there is also a place resembling the location in the cinematic, which backs that up.
However, the problem with that and using it as the whole "where will fight him" thing, is that he royally messed that place up when he left. Maybe he'll return once we push his minions back and start laying the smack-down on some elemental lords though. Once he breaks out i think in the past blizzard has said that after wrecking things he settles down in a new base. I want to say Grim Batol for some reason, possibly something said at blizzcon last year, but I know/believe he's working with the Twilight dudes, so Highlands could work.