No. But it will be the Diablo II of its era.
This is Blizzard's usual MO. They give dates when the game might be done, and if it isn't done to their satisfaction, they delay. It happened with Diablo II, Warcraft III, World of Warcraft, and with Starcraft II, as well as expansions on these games. Generally, you want to add at least a year or two to the release date on any Blizzard game.
Now, if it doesn't come out by, say, 2014, then I'd toss it in with Stafcraft: Ghost.