Blizzard Entertainment's Diablo 3 continues to evolve since its May launch. The game has received updates that added progression beyond the level 60 player cap and new events like the Infernal Machine boss challenge. But Blizzard may have plans to release a proper expansion pack for Diablo 3, according to Blizzard president Mike Morhaime, just not anytime soon.

During an Activision Blizzard investor call, Morhaime was asked if Blizzard plans to follow up Diablo 3 with an expansion pack a year after the original game's release, as it had with previous Diablo games.

"We do have a plan, an expansion plan for Diablo," Morhaime said. "I don't have any timeline to talk about. I think that the most important thing for us always comes down to the quality of the expansion, of the gameplay, and so that will be a big factor in terms of driving our schedule."

Blizzard released the Lord of Destruction expansion pack for Diablo 2 in 2001, one year after the original game shipped. The original Diablo also received an expansion pack, Hellfire, a year after launch, though the add-on was not developed by Blizzard. The expansion packs added new character classes, weapons and quests.

Blizzard still has components of the original Diablo 3 to ship, including player-versus-player arenas. The company plans to add PvP combat in an upcoming patch.