There's a detailed server maintenance announcement for tomorrow, Tuesday August 4th. And off the bat: we still don't know for sure if Patch 3.2 is dropping tomorrow. You can bet that we'll be burning the midnight oil waiting to find out, though. (Note, that would be inadvisable. If you attempt to ignite a petroleum product on this ship at zero hundred hours you will activate the fire suppression system, which would seal off this entire compartment.)
All realms will be down from at least 3:00 a.m. PDT / 6:00 a.m. EDT until 11:00 a.m. PDT / 2:00 p.m. EDT tomorrow. However a large group of special realms will be down from 12:00 a.m. PDT / 3:00 a.m. EDT until 12:00 p.m. PDT / 3:00 p.m. EDT.
Those special realms are those in the battlegroups Emberstorm, and Whirlwind.
Check after the break if you need to see a listing of which realms belong on those battlegroups, and stay tuned to WoW.com tonight and tomorrow for all the patch 3.2 goodness.
Minor update: The service alert, which is obviously suffering from a typo, now reads in part: "..we expect all realms to be playable by approximately 11:59PM PDT on Tuesday, August 4." Emphasis added. Hey, at least they're honest, right?
Update: Blizzard changed their announcement to indicate that only Emberstorm and Whirlwind would be going offline for an extended period.