After the Alliance laid siege to Undercity, Genn was able to retake Gilneas and resettle his people and settled in happily with Tess and Mia.
Greymane has been vigilant and there are few threats in Gilneas anymore, only the Ettin stubbornly cling to the mountains and hillsides, unable to be dislodged.
While some of the land still suffers from the Forsaken's blight and the fierce warfare that wracked it, the Worgen's druids, harvest witches, and Night elf allies have largely patched up the region. There's a sizeable chunk of the population now that aren't worgen, but the curse can be accepted voluntarily in Blackwald by any citizen that gets permission from the druids there, though they test candidates strictly to ensure people can handle the power responsibly.
In a few short years, Gilneas has become a mercantile superpower in the Alliance due to mending fences with Kul'tiras (Kul'tiras is better at mass production but Gilneas has a reputation for more stylized or higher quality work), rebuilding its naval forces for shipping (
The Howling Fleet), and its ties to the scattered Night Elven settlements throughout the world. Much of its western coast has been carved into new harbor areas which have a short way by road to its capital.
A large part of Gilneas's development is that, in order to keep up with Kul'tiras's closer ties to the Mechagnomes, Greymane worked out a deal with Ironforge to have an outpost of dwarves (mostly Dark Irons, But some Bronzebeard and Wildhammer) set up at Emberstone mine, and they have helped rebuild Gilneas's industrial base. Although Gilneans still don't like most Horde races they have surprisingly seen a growing servant/worker class of *Kobolds* that were displaced from the Southern Eastern Kingdoms and other parts of the world over time. (Yes this is just because I wanted posh kobold butlers and candlemakers in Gilneas, so sue me)
The Greymane Wall's been repaired, and it now has multiple waystations to facilitate trade with the resurgent "New Lordaeron" to the north all along its outer and inner sides. Crowley and his family technically live in Gilneas but they spend most of their time in Silverpine helping Gilneans reign in the Bloodfang worgen and hunting after
"Banshee's Echo" Forsaken who are essentially extremists who cling to hostilities despite the Graveholme forsaken nominally being at peace.
Shadowfang Keep is now firmly under Gilnean control while Fenris keep was gifted to New Lordaeron. A large canal has been dug to connect the lake to the Sea and for a time it greatly improved trade between the rebuilt Undercity, now known as Dawnbreak City, and much of the rest of the continent, though recently the canal's been overrun by one of the dozens of petty Naga lords and ladies that scattered after Azshara's disappearance.
The Sepulcher has caved in, something messed up is going on in there...
Stormglen has become popular as a stopover for Pandaren and ships from Stormwind or other parts of the southern eastern Kingdoms, while Tempest's reach is primarily favored by smugglers.
Although Gilneas's primary religion is still the Light, crossover with the Night Elves and Kul'tiras has led to a sizeable portion of the populace also worshiping the wild gods, the Headlands are now home to a modest grove where the Night Elves primarily congregate when visiting the region, but after Teldrassil many have even settled their permanently due to their close ties to the Gilneans. Most Gilneans balance their human and worgen halves, but some do still prefer to give up their human life and live entirely as worgen. Many who walk this path prefer to live in the Blackwald still or join Packs out in Silverpine, though others travel overseas to Night Elven territories on pilgrimages or to settle permanently. It's not uncommon for even non-worgen Gilneans to go on one of these pilgrimages if they venerate the wild gods as skilled hunters.
Gilneans helped repopulate Drustvar after the horrific attacks by the Drust on the region, clearing much of the Crimson forest and have integrated into the zealous monster hunting Order of Embers that is based in the region. As a result, The Order of Embers has established outposts in many Gilnean holdings.
Bradensbrook, once a mere refugee town in Val'sharah, has become a key trade hub between Kalimdor, the Broken Isles, Kul'tiras, The Eastern Kingdoms, and even Northrend. So valuable is it that the Night Elves have even renovated the once haunted Black Rook Hold and transformed it into a modern fortress to defend it, with a contingent of Gilnean and Kul'tiran soldiers stationed alongside the Sentinel and Warden forces there.
Darkshore and Felwood remain popular stops for Worgen seeking to let loose some of their Bloodlust, as while the regions have largely been cleared, some undead and demons still lurk in the corners of the areas. Worgen that go so far as to consume satyrs have begun undergoing unusual transformations though...
Worgen have helped the night elves reclaim Sardor isle and while Feralas is remote, its strong natural ties make it a popular destination for Worgen as well.