Three optional expansions are currently available: The Burning Crusade, released in January 2007, Wrath of the Lich King, released in November 2008, and Cataclysm, released in December 2010. Players are not required to purchase the expansions to continue play. However, the expansion packs allow further leveling of characters beyond level 60 and access to newer content and areas. Characters cannot enter the additional regions without their respective expansion packs.
On June 28, 2011, The Burning Crusade was automatically applied to all previous Warcraft accounts, and all new Warcraft accounts created in the future will have The Burning Crusade applied at no additional cost. All The Burning Crusade content is now effectively part of the original game.
Beta Testing for Mists of Pandaria was opened on March 21, 2012.