Fan site Diii.net takes the time to speculate what's certainly a strong possibility. When Blizzard Entertainment announced its action RPG Diablo III they still haven't discussed potential expansions packs. Of course, it's obviously too early, seeing as there's a lot of work awaiting the developers for the main game.

Blizzard CEO Mike Morhaime talked on the subject of WoW expansion packs recently. "I don’t think Blizzard will ever be able to do sequels of products like a 'Diablo III' or 'Diablo IV' on an annual basis, but we might be able to do expansions to those games close to annually," said Morhaime to MTV. "Hmmm, is there more profit? In an ideal scenario, I think we’d probably do [expansions] a little bit more often than we’ve been able to do. But I agree — I think putting too many expansions out too frequently, you probably get to the point where people do need to start taking a little break," he added.

When Diablo III finally hits store shelves, I would imagine that a few add-ons are Blizzard's likely course of action, as opposed to a completely new installment.