The Secrets of Ulduar -- the next major (free) content update for World of Warcraft -- will open the gates of Ulduar and allow heroes of the Horde and Alliance to venture into the titan Pantheon's ancient halls.
In addition to an all-new raid dungeon, Secrets of Ulduar will introduce the new dual talent specialization system, new quests at the Argent Tournament, and the epic tier-8 armor sets. (You can read the complete list of updates here.)
Beneath ancient Ulduar, the Old God of death lies, whispering.... Tread carefully, or its prison will become your tomb.