Today's maintenance will be extended by two hours (to 11:00 AM PDT) to apply a minor bug fix patch.  Of course, what all of us are wondering is which bugs are getting fixed... I guess we'll see when the servers come back up.

Also during (and beyond) this maintenance window, realms Doomhammer, Icecrown, Deathwing, and Kel'Thuzad will be migrated to new hardware.  This migration may take as long as 24 hours, so users on those realms should plan for extended downtime.  All active players with characters on those realms will receive an extra day's credit on their account to compensate for the downtime.

This article was originally published on WoW Insider.