All realms will be undergoing maintenance Tuesday November 3rd from 3:00 a.m. PDT until at least 11:00 a.m. PDT. This is more or less the standard maintenance that we've all come to know and love so much. So hopefully this won't come as a surprise for folks.
We need to be diligent here and note that there is absolutely no indication patch 3.3 will drop tomorrow. That event is still at least a few weeks off from all indications coming into WoW.com HQ.
Enjoy the downtime if you're not working -- go get some sun, eat a cheeseburger, do something off the game. It'll be leveling up in real life! Fun!