Blizzard has posted some information regarding new dungeon Ulduar, to be included in the next World of Warcraft patch.
The dungeon encompasses two separate raiding areas and you’ll need the help of siege vehicles to help you assault the denizens guarding the entrance.
Once inside, you can expect a face-to-face encounter with an enormous tank called The Flame Leviathan. Normal spells and abilities won’t work against it, so those new siege machines should come in handy.
More goodies are on the official site.