No, I'm sure it will sell a lot, but we're in no shape to see another Warcraft game for a long, long while. (Except for WoW expansions)
We already had Warcraft III, Warcraft III: Frozen Throne, and now World of Warcraft. We've seen way too much Warcraft for the 21st century, and Blizzard will probably start working on Diablo and Starcraft titles soon anyway.