Arthas Blizzards has posted a note on the log on screen.

We encountered some issues and need to extend the maintenance.  We currently estimate that all realms will be playable by approximately 1:00pm PST.  Thank you for your patience.

I am speculating that we will see the next large pre expansion event.  It only makes since after the popular plague.  I do hope so. . I’m getting bored. . Need more fun story line driven fun.