No folks, it's not just you. WoW is undergoing maintenance today, as is usual. Maintenance has been going on since 3:00 a.m. PST / 6:00 a.m. EST and will last until 11:00 a.m. PST / 2:00 p.m. EST. The only difference is, this time around, the launcher isn't even working, which is causing a lot of people to wonder if something is wrong with their internet configurations (thanks, no doubt, due to the lovely maintenance box).
But be confident that nothing is probably wrong, especially if you're reading this post. The patching server just seems to be down. Everything will be up again soon.
Blizzard's maintenance announcement is as follows:
Our regularly scheduled Tuesday maintenance will begin at 03:00 a.m. PST, January, 11 and end at approximately 11:00 a.m. PST. During this time all realms will be down and not accessible for play. Thank you for your patience