On the 3.0.8 Public Test Realm (and I assume, on live), there is a new angler fishing in Dalaran's Underbelly - Sebastian Bower. He says:
I know, I know... "fishing in a sewer?" But you'd be surprised what you can catch down here. I've even heard stories of sharks, if you can believe it.
Well, there is a large shark in the rogue area - but you cannot catch it. I've tried to confirm these "stories of sharks you can catch" during testing, but I did not catch anything new in over a thousand catches.
But I'm still curious... Is there anything new lurking in the water?