World of Warcraft: Mists of Pandaria colloquially referred to as Mists or MoP is the fourth expansion set for the massively multiplayer online role-playing game (MMORPG) World of Warcraft following Cataclysm. It was announced on October 21 2011 by Chris Metzen at BlizzCon 2011 and was released on September 25 2012. As of October 14 2014 Mists of Pandaria is included for free with the base game similar to previous expansions.