Please Read! For all those gamers this affects, be aware of your Realm's Restart time, so you arent stuck at your loading screen! Here is the list:

We will begin rolling restarts for all realms, except those listed below, on Wednesday, May 3rd beginning at 5:00 AM PDT. The rolling restart procedure resets sets of realms in staggered intervals. The exact reset starting time for your realm may be shortly after the stated 5:00 AM PDT.

The following realms will not be affected by these rolling restarts.

Andorhal
Anetheron
Archimonde
Black Dragonflight
Dalaran
Dalvengyr
Deathwing
Dentarg
Doomhammer
Duskwood
Executus
Haomarush
Icecrown
Kel'Thuzad
Khadgar
Mal'Ganis
Norgannon
Scilla
Steamwheedle Cartel
Thrall
Turalyon
Ysera
Ysondre
Zuluhed ~ Blizzard