A little while ago, 2 am Paris time, servers went down in the EU for emergency maintenance. More specifically, "emergency database maintenance." They're estimated to be down until 4 am Paris time, which by my estimate is another hour or so. Should that maintenance be extended any further, we'll be sure to let you know right here on WoW.com.
Many thanks to our followers on Twitter for alerting us of this downtime, because our European staff members are apparently off doing silly things like sleeping. Thanks a lot, guys. Because of that, I'm now inflicting cultural stereotypes on you all in the form of the picture at the top of this post. Don't take your rage out on me, take it out on the warlock.