Patch 3.3.0 is a content patch that included Icecrown Citadel as a new raid instance as well as three 5-player dungeon wings in the Frozen Halls. Patch 3.3 was to be the last major patch before the release of World of Warcraft: Cataclysm. Undocumented changes can be found at Patch 3.3.0 (undocumented changes). Latest patch notes can always be found: