Quote Originally Posted by pinotnoir View Post
It does seem like Recycleclysm. I bet every raid will be recycled again in the old world.
In time, that could be what they do. They re-used Naxx for this expansion. If the idea behind the Onyxia and old-world revamps is that they wanted to refresh it and encourage people to enjoy it again, at some point they might refresh Molten Core. The entrance to one of the new raids in Cataclysm will be reached through BWL apparently.

But keep in mind that this expansion has seven new zones along with a re-vamp of the entire old world, which by itself is probably more work than the previous two expansions combined. The zone re-vamps don't just include new terrain, there are new quests and new gear from quests and dungeons. It looks as if there will be more raid zones, and possibly more 5-man dungeons (which is impressive if it happens, considering the level range is cut in half). They're planning sweeping changes for talents and high-end character progression, for PvP progression, and for guild progression.

I wonder if they'll re-vamp old raids with each expansion, though. The one after Cataclysm will probably lead to a level cap of 90 or 95. No one runs Molten Core for progression anymore, I could see it being turned into a 10/25 raid in the future.