Update: The servers are back up early, so you can jump in and get playing right now if that's your thing.
Update: Yes, the servers are up.
The WoW team has gotten so good at maintenance that the servers have been up early almost every recent maintenance period.
Welcome, WoW players, to patch day!
If you've been playing WoW for long, you know downtime is a fact of life.
Another day, another major DDoS attack against Blizzard and the network providers that handle traffic to their games.