So, this is concept I started developing a few months ago before work got busy, but I am too tired to really write a proper post about it.
The jist of it was that each race would get 3 "character archetypes" which each provides 1 of 3 racial abilities (mostly using the existing and parallel Allied Race racials); then 1 racial class-ability (as Priests once did) regardless of archtype. More-often-than-not this would be an enhanced version of an existing class spell. Both of these abilities can then be augmented with conduits. Conduits also provide racially-thematic Class passives. Finally, the archetype passives are class-agnostic.
To minimise dev-time they would want to create minimal class-specific bonuses and keep those class-specific bonuses agnostic of specialisation (invariably, like with covenant abilities, some would serve certain specs better than others) and try to incorporate all existing racials and re-skin existing conduits and some other stray legacy bonuses to prevent power bloat. This also has the benefit of making Allied races an entirely cosmetic decision/unlock.
Your initial archetype would be chosen at character creation, with the ability to re-spec being superficial (simply a case of going to visit an "archetype leader" out in the wild somewhere and doing a thematic quest for them). No conduit levels. No gated RNG unlocks. You unlock the whole system simply as a parallel to levelling.
Orc:Maghar - Oathbound (Orcish Clans themed), Warlord (Horde themed) and Bloodthirster (Chaos themed)
Troll:Zandalari - Defector (Blood and Sand), Shadow Hunter (inc. Witch Doctor) and Loa-Chosen
Nightborne:Belf - Aristocrat, Magistrix and Felsworn
Pandaren (Both Factions) - Lorewalker, Houjin and Tushui
Highmountain/Tauren - Nomad, Chieftain, Outcast
Mecha/Gnomes - Tinkerer, Researcher (Light/Arcane themed), Rebel (Defector?)
Worgen:Nelf - Wildling, Cursed (Death and Fire), Elune's Chosen (Light and Arcane)
Lightforged/Draenei - Man'ari, Lightsworn, Void-touched
Kul Tiran/Human - Bandit, Knight, Mariner
Dark Iron/Dwarf - Aerie, Mountaineer, Shadowforged
These four don't have direct Allied Race parallels so they adopt a mix of suitable other archetypes already mentioned, re-skinned and with access to some cross-faction archetype options. There's 3 original archetypes between them with Goblin and Vulpera mostly sharing a set, and Forsaken and Void Elves getting particularly extensive reskins archetypes which would reskin many of their abilities akin to Warlock Green Fire.
Golbin - Salvager, Alchemist, Tinkerer
Vulpera - Scavenger (Salvager Reskin), Tinkerer, Nomad (Caravan Reskin)
Forsaken - Apothecary (Alchemist Reskin), Cultist (Dark Ranger and Necromancers go brrr) and Champion (Knight Reskin)
Void Elves - Researcher (Void Themed), Magistrix (inc. Spatial Rift), Noble (High Elf Aristocrat Reskin, inc. Arcane Torrent)