Next one will take more time, though.

Mike Morhaime, chief executive at Blizzard, says that they are currently aiming to release an expansion for World of Warcraft every year or so. However, the next one after Wrath of the Lich King will undoubtedly take longer than that.

"That's still the ideal goal," he told Eurogamer, when we asked if Blizzard still planned to release an expansion each year. "But as with anything, there is this underlying rule that trumps everything, which is that we'll take as much time as we need until... it reaches the expectations of ourselves and our players."

"Right now we're on the longer-than-a-year plan," he explained. "The next one, I think it is still unlikely that we're going to get it down to a calendar year."

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