Taken from www.************.com
Both EU and US realms are getting free character migration to help with the servers load.
Quote from Blizzard staff
European Realms
The following Free Character Migration will be available December 5th to 11th:
From: Crushridge, Frostmane, Grim Batol, Kazzak, Outland
To: Boulderfist, Daggerspine, Kor'gall
American Realms
The ability to move a character on the selected source realms will become available on Thursday, December 6 at 12:01 PM PDT, and are scheduled to run until Thursday, December 13 at 12:01 PM PDT. In the event that a realm meets our transfer goals before the scheduled end date, the transfers to that realm will be disabled. We highly recommend that if you are planning to transfer that you do so at your earliest convenience.
From: Burning Blade, Warsong, Laughing Skull, Arthas
To: Jaedenar
From: Spinebreaker, Mug'thol, Mal'Ganis, Tichondrius
To: Nazjatar
From: Sargeras, Dragonmaw, Bonechewer, Illidan
To: Maiev
Hope this maybe alerts some of you who did not know this, now it your chance