You can move from Al'Akir, Frostmane, Grim Batol, Outland, or Twilight's Hammer over to Burning Steppes or Spinebreaker. Of course, this only for all our European readers. No U.S. realms are current open for free transfers.
If you want to take advantage of this, do so quickly! They often close down these transfers early when they meet their internal goals.
Enjoy your new realm!