If you havent seen,
http://forums.worldofwarcraft.com/thread.aspx?fn=wow-general&t=7767399&p=1&tmp=1#post7767399
The recap. These realms are going down for 24 hours. Tonight or tommorow night. (was support to be april 4th.. my buddy told me they might push it back again because of the emergency work they're doing to the login servers)
Aggramar
Andorhal
Anetheron
Burning Blade
Burning Legion
Dentarg
Duskwood
Earthen Ring
Eonar
Eredar
Executus
Gilneas
Gorefiend
Haomarush
Kargath
Laughing Skull
Lightning's Blade
Llane
Malygos
Scilla
Shadow Moon
Steamwheedle Cartel
Thunderhorn
Thunderlord
Turalyon
Ysera
Ysondre
Zuluhed
Archimonde
Dalaran
Khadgar
Mal'Ganis
The time it lists is 24 hours downtime, but the inside word from blizzard is it should take aprox 6-8 hours for all the servers listed - that are not archimonde dalaran khadgar or mal'ganis, which should take 17-18.
-me