Robin's post about fun with kiting yesterday immediately reminded me about the old days of 40 man raiding. Don't worry, this isn't a nostalgia trip per se... in many ways raiding is better now than it's ever been... but one of the things I enjoyed back in classic WoW were the world bosses. Bosses like Azuregos, the Emerald Dragons and Kazzak (as well as summoned bosses like Maws and Eranikus) added a feeling of competition that simply couldn't be had by being the first to clear a raid. If Blizzard wants to bring the antagonism between Alliance and Horde back to the forefront, well, even on a PvE server back in the day one could watch Horde and Alliance guilds jostle over Azuregos. Heck, we were griefed pretty hard doing the green dragons, especially Emeriss, as Horde players would come running up to die under our tank and become mushrooms.
Burning Crusade had a couple of world raid bosses (a recycled Kazzak and Doomwalker) but for the most part they weren't terribly compelling: the gear they dropped was comparable with Karazhan (eventually it was made BoE to try and drive raiders towards it to harvest them for sales, which happened to some degree but is hardly what you'd call a sign of an exciting time, scavenging bosses for BoE's) and it seems like the practice has fallen out of favor since those days. While there are wandering big elites in Howling Fjord and Zul'Drak, they're either just there with no real rhyme or reason, or they're involved in quests.
So I ask you: would you like to see big world bosses return in Cataclysm? Or do you think they're an artifact of an older time, and we're better off without them?