The World of Warcraft patch 3.1 will have a new raid Dungeon known as Ulduar. In the first part you will battle the Iron Army with siege vehicles. In the second part you battle a Flame Leviathan tank. Ulduar is a new type of experience for Wrath of the Lich King players. That is if you can use the Siege Engines, choppers, and Demolishers to make it past the Iron Army. One other cool thing is that mounts will now be able to swim.

Swimming Mounts video:

WoW Lich King Ulduar Walkthrough Video:

World of Warcraft 3.1 Tier 8 Armor Sets Video: