Blizzard Entertainment today confirmed the development of an expansion for its highly popular PC-based MMORPG World of Warcraft. On the game's official message boards, producer Shane Dabiri also announced a free update titled Blackwing Lair. It will feature a 40-person raid dungeon pitting users against the dragon Nefarian and his minions. Additionally, a 20-person dungeon titled Zul'Gurub and the mysterious lands of Ahn'Qiraj in Silithus are in the works. New world events such as a carnival in Mulgore and Elwynn are also planned.

• GameSpot