UPDATE!: It’s 11:42 PM EST and shit still aint’ working WOOO HAAA!
This post just went up:
Our realm technicians have been looking into issues affecting several realms and instances this afternoon. We will provide updates as soon as more information becomes available.
In the mean time please refrain from creating additional threads about realm issues, as [...]

We’re currently in the process of monitoring performance issues on a number of realms. While we’re continuing to investigate a number of additional realms, the following realms have a scheduled maintenance which will begin on Wednesday March 12, at 5:00 AM PDT. We anticipate approximately 1 hour of downtime.
We will be providing updates on [...]

Yes, the servers are stuck at Authenticating across I believe all realms. Blizzard knows, I’ll keep this thread updated as hopefully this gets fixed soon and I can go wail on loot-reaver for a while.
Update: Hey it’s working now neato!