The Howling Oak, a recent addition to the night elf capital of Darnassus, is the new home of the playable worgen and many of the Gilnean refugees after the fall of Gilneas. Its central feature is a "worgen tree" resembling Tal'doren in the Blackwald.
Following the cataclysm and the Gilneans abandoning their homeland, the Howling Oak was grown by a group of Night elf druids who had took a seed before leaving Gilneas. The tree stands for all the Gilneans that have settled in Darnassus while those settled elsewhere in territories that belonged to the Alliance, and all that their people accomplished.
This section concerns content exclusive to Cataclysm.
For a short time Genn Greymane is present here after the worgen starting zone. It would seem that Gwen Armstead is holding the fort down while Genn is in Stormwind with Varian Wrynn. All Gilnean trainers from the Gilneas starting zone are present here other than the druid trainer who has moved to Stormwind. You may also see other people from Gilneas here including named and unnamed NPCs.