Cataclysm will come out around the same time as The Old Republic. Blizzard are smart.
Reading the updates it sounds cool and makes me want to start playing again, but then I remember how shit the game is these days and why I stopped and the desire goes away. I was hoping WotLK was going to change it but as soon as you hit 80 it's the same old crap again. I don't see why 85 will be any different.