The past four days, Blizzard has revealed new Cataclysm expansion screenshots. The first one shows us a Goblin building where a massive explosive has been created. These are the bombs the goblins are using to reshape the region of Azshara into a giant Horde-insignia-shape.
The second screenshot is the new Orgrimmar, with iron spikes. This new architecture resembles that of the Warsong fortress in Borean Tundra and Dragonblight, which shows Garrosh is ruling Orgrimmar as its new Warchief.
The third screenshot is from Stonetalon Mountains. Those goblins are up to something with this bomb manufacturing building. Or is that it?
The last screenshot shows a scene from Uldum within the Halls of Origination.