Earlier, there has been an announcement for free characters transfer for EU PvP realms. Transfers are available from December 17th (yesterday) to December 23rd.
The purpose for the transfer is to solve the population problem. Apparently some of the realms are too populated so this is to balance all other low population realms.
While it is given a timeline between December 17th (yesterday) to December 23rd but any realm might closed sooner when it has reached the max population, so act fast if you want a change.
The migrations available for:
From: Burning Legion, Drak’thul, Sylvanas
To: Ahn’Qiraj, Burning Blade, Xavius
From: Magtheridon (Horde only)
To: Haomarush, Zenedar