My coin on the matter:
World of Warcraft: Winds of Future
The Burning Legion is gone, as same as the Old Gods threat. After the flithy Jailer’s defeat, the people of Azeroth returned home to rebuild what has been broken during so many years of bloody wars.
NEW FACTIONS SYSTEM:
Alliance
Horde
The Forsaken(neutral)
NEW ALLIANCE SUB-FACTIONS: THE KINGDOMS
Kingdom of Lordaeron: Lord Regent Turalyon sets off to cleanse what is left of the old Lordaeron by the corruption of the Scourge, with the help of the Knights of the Silver Hand.
(Rebuilding of Stratholme, of Andhoral, of the old Capital City and the ‘minor’ settlements, annihlation or annexation of the Scarlet Crusade to the Alliance/Silver Hand ranks. Turalyon becomes King, Arathor as his righteful heir).
Kingdom of Gilneas: King Greymane finally sets sail to his forgotten reign to restore it.
(War against the Banshee Loyalists, revamped Gilneas).
Kingdom of Stormwind: As main leader of the New Alliance, King Anduin marries Taela Fordragon and works to restore the nearby lands.
(Revamp of Westfall, Redridge, Duskwood, part of Stranglethilorn, new garrisons in the Badlands, to keep the nowdays ‘useless’ Dark Portal in check).
Kingdom of Arathor: Definitive re construction of Stromgarde and re-establishment of the Trollbane’s dinasty on the throne.
Kingdom of Kul’tiras: Restoration of the lands around Theramore/Southern Kalimdor.
Council of the Three Hammers/Gnomes: Ironforge helps King Mekkatorque and the Mechagnomes to retake/rebuild Gnomeregan. Restoration of the Twilight Highlands(Wildhammer Clan), Blackrock Mountain (Dark Iron Dwarves), Loch Modan and the Badlands.
The Draenei: Securing of Exodar, definitive settlement of the old differences with the Brokens, adaptation of the Lightforged and the Army of the Light to the rules of Azeroth.
The Night Elves: Colonization/purification of Southern Kalimdor’s forests, new Capital City(not a world tree this time), end of the curse of the Night Warrior.
NEW HORDE SUB-FACTIONS: THE CLANS, THE TRIBES
The Clans: Choose between one of the many orcish clans, settle down the differences, and cooperate to conquer the lands nearby Durotar once and for all.
The Trolls: Fight to unify your people under the Horde’s banner(shared campaign with the Zandalari)
Blightwater Cartel/Vulpera: Retaking of Kezan, war against rival cartels, fall of Gallywix.
Tauren: Bloodhooves/High Mountain vs Grimtotem/Feltotem(?)
High Kingdom of Quel’thalas and Suramar: Marriage between Lor’themar and Thalyssra, unification of the realms, war against the few corrupted sin’dorei and shal’dorei.
A/H: Rise of the Shado-pan (Final strike of the Pandaren against the Mogu and the Mantid, supported by both Horde and Alliance.)
THIRD FACTION: THE FORSAKEN.
Under the guidance of Calia Menethil, Lilian Voss and Derek Proudmoore, the Forsaken remnants built a new settlement in the frozen shores of Northrend, pursuing the desire of a ‘peaceful existence’, far from the rest of the world.
-Revamped world.
-Possible new races(Centaurs, Ogres, Mogu, Vrykuls).
-Racial campaigns.
-Revamped starting zones
I may have forgotten to mention some race… Trying my best to explain my view on an expansion I would love to play.
The endgame could introduce the invasion(direct, and brutal) of an external force, like the Void, or the Light itself-> the ‘united’ people of Azeroth joins the Cosmic War.
Shame it won’t never happen.