According to their contact, named "Blizz guy," we're going to have an "Into the Maelstrom" expansion, in which we go... into... the Maelstrom! and the Light only knows who we're going to fight there. Also, in lieu of new talents, Blizz guy says we're finally going to get our long-awaited Hero Classes that we can level up in, all the way to 80.
Now personally, I see all the hints pointing to Northrend, and absolutely nothing pointing to the Maelstrom, so I'm a lot more inclined to trust our own sources -- but we'll put this out there for all you who just love rumors and speculation! MMO-Champion and IGN can't both be right on this one, though I suppose they could both be wrong.
Which one do you think seems more likely? Or do you have an anonymous source of your own?