"Since in Cataclysm we will have a lot more underwater fighting and stuff, will we be able to eat while in the water or anything? It would be kind of lame to surface and have to swim to land just to eat every time. Maybe they could have it where you can eat when you surface or something."
Yes, there's special underwater food available for Vashj'ir.
"What happens with the Mountaineers who have been fighting the rogue black drake for the last 5 years we see when flying from Ironforge to Stormwind? Are they still there?"
The most satisfying moment of my time in beta so far was flying up to that canyon and killing that damned rogue black drake I'd been unable to touch for five years.
"Does anyone know where Thrall is going and doing on his leave of absence?"
He's on a quest to heal the world after the Cataclysm. The first time you meet him is on your introductory quest to Deepholm, where you see him maintaining a dimensional rift in the center of the Maelstrom, letting adventurers through to assist the Earthen Ring in reassembling the World Pillar.
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