The Temple of Karabor was the center of draenei worship until its priests were slaughtered by demonically corrupted orcs. In the massacre’s aftermath, the warlocks of the Shadow Council seized the structure and gave it a new name: the Black Temple. Once ruled by Magtheridon, it is now home to Illidan. The Betrayer awaits challengers to his rule deep within this ancient structure. To gain more information that would help in planning a successful strike against the Black Temple’s occupier, watch this trailer or read through this preview of what awaits such challengers in the upcoming patch.
Original post by World of Warcraft Community Site