Surprise! Urgent maintenance today
If things get extended, we'll let you know about it.
The full statement by Blizzard is as follows:
Blizzard — Maintenance
We will be performing urgent maintenance on all realms to resolve a technical issue. Maintenance will begin at 5:00 AM and conclude at approximately 11:00 AM PST.
Thank you for your patience.
Instead of the normal gnome doing her maintenance thing, I've included a video of some of my favorite music out there: Vince Guaraldi's O Tannenbaum, visualized to A Charlie Brown Christmas, of course.