In World of Warcraft: Cataclysm, Darkwhisper Gorge will be a part of Mount Hyjal zone and will serve as a base of operations for Twilight's Hammer clan.

Your successes in Hyjal will ultimately lead you to the assembly of the Ancients, who have set a plan in motion to bring a powerful ally and demigod back into this realm.  Before that can happen, however, you will need to infiltrate Darkwhisper Gorge disguised as a follower of the Twilight’s Hammer, acting quickly to sow discord within the entrenched faction, weakening it for the coming struggle. Only time will tell if the Ancients’ plan is a success — but you’ll need to do your part if there’s any hope of saving Mount Hyjal from the twilight dragons, Ragnaros, and his minions of the Elemental Plane.
Firelands