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.
More as it develops.
Update: New dungeon finder bosses are active after you stop the invasions.
Update 2: Random dungeon finder bosses are dropping 251 loot, and securing each city opens up two bosses.
World of Warcraft: Cataclysm will destroy Azeroth as we know it; nothing will be the same! In WoW Insider's Guide to Cataclysm, you can find out everything you need to know about WoW's third expansion (available Dec. 7, 2010), from brand new races to revamped quests and zones. Visit our Cataclysm news category for the most recent posts having to do with the Cataclysm expansion.