Not that this should be a surprise to anyone...
But maintenance has been extended until 1:00 p.m. PDT / 4:00 p.m. EDT. There is no indication why the maintenance has been extended, but that's the norm as well.
You can find out what's in the patch over on the Patch 3.1.1 Patch Notes and Bug Fix List, as well as by checking out our updated Guide To Patch 3.1.
We'll update this post with the latest news / server status when we have it.