Blizzard Entertainment, creator of the popular MMORPG World of Warcraft, has unveiled plans to create a second expansion for the online RPG that has over 9 million paid subscribers. The first WoW expansion, Burning Crusade, sold over 2.4 million copies during its first 24 hours of release and more than 3.5 million units in its first week on the market. The newly announced expansion, Wrath of the Lich King, will add a Death Knight Hero Class, new levels, siege engines, new kinds of character customization, and the harsh new continent of Northrend with its new zones, dungeons and the undead legions of the Lich King.
Blizzard has not yet announced the release date of the new expansion, which the company unveiled over the weekend at BlizzCon in