Beware, because there are spoilers for patch 8.2.5 in this post.
In patch 8.5.1, Horde players will finally be able to unlock the Zandalari as an Allied Race -- here's how to make that happen.
One of the things we say a lot is "in beta, everything is subject to change" and that's because this happens every beta.
Once again I feel compelled to warn you of impending spoilers for the story of Battle for Azeroth.
If you're wondering who attacked whom first, the new datamined spoilers for the Zandalar recruitment storyline found by the folks at Wowhead may just solve that for you.