I agree that bosses in cataclysm are going to need alot of expanding during our questing, including mentions, sightings and impact before we end up raiding them.

There will be alot of new raids and new dungeons in Cata all with only one popular boss involved... Deathwing.

Maybe Cho'gal will return as a raid boss too as mentioned as hinted he didnt die in the comics.

But at least TBC and WotLK there were loads of familliar bosses that we have heard of or reconguised. Time to use that great big (god like) brain of yours Metzen and come up with some lore roles :D

Cata will lack fresh and familliar faces which bliz will need us to make remember.

Hopefully not all will be reused such as Nefarian and Raggy.(I am aware raggy NEVER died, he was just banished )

Besides Deathwing, not much is yet known about new bosses and their lore in Cataclysm, so now is the time to speculate before new information is revealed ;-)

Speaking of speculation, which bosses do you think will appear in Cataclysm?