Good afternoon-evening, Ascended!
In order to fix up a couple of post-1.9 issues, we're going to be bringing the NA shards offline briefly at 4:00pm PDT, 6/27/12. The estimated downtime is ** 30 minutes ** to be safe, though we'll try to keep it a lot shorter than that.
Patch notes will be updated - this hotfix build will be included as part of the 1.9 update for Europe later tonight.
As usual I'll be here when the servers come down to let you know when they're on the way back up.