In vanilla and BC, there were world bosses like Azuregos and Doomwalker that spawned out in the open world and could be taken down by a raid. While these bosses were often farmed by the highest progression guilds on the servers, they were often so quickly killed and so long in respawning that not many players got to see them. Now, in Cataclysm, a new take on this idea is being implemented.
Valnoth later responds to a player's concerns that these bosses will definitely be doable by a five-player group and are not intended as true raid bosses. Frankly, while I loved farming Azuregos, the Dragons of Nightmare and Kazzak back in the day, it was really a drag trying to do them with smaller-than-optimal raid groups in order to beat other guilds. There was a lot of griefing, and the spawn rates were terrible. Hopefully, with their being made heroic 5-man quality, they'll be able to spawn more often and more people will have a shot at them.
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.