About an hour and a half ago I made the mistake of logging out of the game. Now I can't seem to get back in and evidently many people on multiple servers are having the same problem. It's a shame, really, since I was planning another attempt at the heroics, but alas it was not meant to be.
My guess is that one of two things could happen. One is that we will be back up and running soon with little problem. The other option, and the far more likely one in my opinion, will be that these problems will keep occurring throughout the night. I am betting that something is happening with the Patch 2.1 install and it is messing authentication up. Nothing official on what is happening, but we do know that all is not well in Azeroth. Until then, I guess it's time to dust off your consoles, read a book, or catch up on all that homework you've been slacking on.