Cataclysm: Part 4 of the elemental invasion is live

Not on Ghostlands, yet.

Cataclysm: Part 4 of the elemental invasion is live: "

Cities are under attack. Elementals are invading the capital cities of Orgrimmar and Thunderbluff for the horde and Stormwind and Ironforge for the alliance. It's madness in the streets and it is awesome. Defend the cities by closing rifts and freeing trapped and scared citizens. We do not know if the bosses are up yet, and it looks like it is not live on all servers yet.