Those hard-working dataminers are at it again, plumbing the depths of PTR code and coming back with their hands coated in binary soot to bring us new information. Fresh from the mines this time are some early details on some World of Warcraft Allied Race unlock requirements.
The information comes from the most recent 7.3.5 PTR build and offers details on how to unlock the Highmountain Tauren, Nighborne, Void Elf, and Lightforged Draenei races:
Highmountain Tauren: Earn the "Ain't No Mountain High Enough" achievement and Exalted with the Highmountain Tribe.
Nightborne: Earn the "Good Suramaritan" achievement and Exalted with the Nightfallen.
Void Elf: Earn "You Are Now Prepared!" and Exalted with Argussian Reach.
Lightforged Draenei: Earn "You Are Now Prepared!" and Exalted with the Army of the Light.
Those who want to play as the Allied Races will also need to have at least one level 110 character, complete a special scenario, and (naturally) have purchased the Battle for Azeroth expansion.
The datamining expedition also uncovered some other items of interest such as Allied Race tabards, new boosted character gear, and some more Cataclysm Timewalking. You can read up on all of the findings over on Wowhead.
Presumably, many WoW players have already unlocked most of these requirements already, but if you haven't at least now you have something of a head start. Unless, of course, there are going to be some additional requirements that aren't otherwise part of the PTR.