A three year time jump, Eastern Kingdoms is mostly controlled by the Alliance and Kalimdor predominately held by the Horde. There are exceptions.
Kalimdor
-Most of the continent has a train that loops around the continent.
-Zoram'gar Strand is a new giant shipyard for the Horde, a mish-mash of Goblin, Zandalari, and Mag'har assets, a city has sprung up around the shipyard, one of the trains stops.
-Azuremyst/Bloodmyst Isles, being locked away from Alliance support, the Draenei have migrated to Eastern Kingdoms. The Houjin have settled here, and it now their starting zone. The local Furbolg have been assimilated into Houjin culture, and now Houjin Pandaren have access to Druids, and unique customization options that show a more wild and primal aesthetic. Blood Elves and Goblins use Bloodmyst has become the new home of the Forsaken, loyal to the Horde.
-Silithus and Ahn'Qiraj: The Fallen Kingdom have been renamed are the Void Elves have migrated here. The sword is gone, its a void desert, mostly these two zone are completely rebuilt.
-Mountain in between Un'Goro/Silithus/Feralas, is Mag'har base, think Blackrock Foundry and is kept there to "keep an eye" on the Void Elves.
-Dustwallow Marsh, is a Horde allianed Ogre territory besieged by the Grimtotem. Theramore has become a highmaul-esque port town, called Thra"mor.
-Stonetalon Mountains, Sunrock Retreat is now a Highmountain outpost. Gronn and Goren have taken to mountains, and posses a new threat, they are borrowing deep and bringing new found terrors to the surface. Grimtotem have also beefed up their presence here.
-Barrens, is more or less similiar to how it is now. Bridge over the crack, Saberon attacks + a friendly Saberon village in the north.
-Ashenvale, Bashana Runetotem acts as Overlord of the region, and has put a stop to the harmful timber extraction, creating balance within the forest.
-Night Elves under Tyrande have stayed waging an endless war on the Horde, random night elf attacks while in the zones as Horde players.
Eastern Kingdoms
-Lordaeron has been more or less purified and taken over by the Draenei, Lightforged, and Broken. An act that pushed Calia further into the Horde's grasp, and feeling betrayed. Anduin tried, but more or less the fear the humans have for the undead kept his hands tied.
-Gilneas, re-taken, Gilneas City a new Alliance hub.
-Night Elves that migrated to EK are more or less loners, and don't amass in groups much at all. However they have built two settlements within the branches the Great Trees in Seradane and the Twilight Grove. Malfurion presides over these Night Elves.
-Stratholme is not longer on fire and no protected by dark magics. Sylvanas has taken control of the city and now she and her loyalist reside here, rebuilding and amassing whatever it is she needs.
-Loch Modan, the eastern portion of the zone has become the Tushui starting zone, they have years of being part of the Alliance have access to paladins. and now have unique customization options that the Houjin don't have.
-Stromgarde is controlled by Danath, and is also an Alliance hub. Hammerfall and Ar'Gorok no longer stand in the zone.
-Quel'Thalas is still held by the Blood Elves. Ghostlands is less Ghostlandy, but houses Forsaken refugees. The ruined half of Silvermoon City is rebuilt. The Scar has been, cured but is also a river, that runs into a lake where Deatholme use to be. Windrunner Spire, has now become the Spire of Al'ar and houses the phoenix egg.
-Zul'Aman is retaken by the Revantust and Zandalari.
-The Wildhammers and Night Elves have wrested control of Jintha'alor from the Revantust and Forest Trolls.
-Twilight Highlands is mostly controlled by the Wildhammers, new settlements of Ironfoge Dwarves and Dark Iron Dwarves have arisen. The Dragonmaw of the region are making amends for the role they played in aiding Garrosh, and need back up at Dragonmaw Port from Orgrimmar.