Bornakk announced last night that selected US PvP realms will be given free character moves starting at Noon pacific time today, July 10th, and ending on July 17th. As always, Blizzard does reserve the right to close transfers early once their quotas are met, so be sure to get your transfer request in as early as possible if you plan to move. Once the transfers are open, you can visit the character move page to request a transfer.
The realm transfers are as follows:
Characters from the Barthilas and Frostmourne realms may move to the Dreadmaul realm.
Characters from the Illidan, Mal'ganis, and Warsong realms may move to the Zuluhed realm.