I saw everyone go offline, and I looked like I stayed online, but my buffs were at 0 seconds, and still there, so obviously i wasn't online anymore. Now I go to log in, and it tells me as soon as I enter my password that I have been disconnected, Cy is having the same problem so it's not just me.
Same thing happened to me :(
Try closing wow and opening it up again. I had a similar issue and a restart did the trick.
lol i did that like 4 times. But it's working now. Someone at blizz probably kicked a plug! :P