So I was looking at the ArtOffLoop animation in WoWHead. For those who don't know, the ArtOffLoop animation is actually the animation when you're holding your Heart of Azeroth neck piece when you're upgrading or looking at it. And what I notice is that this animation should only be on playable races. Because it doesn't make sense to give this kind of animation to a NPC race, unless they're going to be a ally race.
So I check it out by seeing every playable races that may have this animation. And sure enough all of them have it. The only ones that don't have this yet is the Zandalari Trolls (but the Jungle Trolls do have it) and the male Nightborne. So Blizz haven't gotten to them yet.
Then I check out the other races that may have it like Kul'Trian, Vulpera, and others that's not announce yet. And the results will shock you! Seems that Kul'Trian, Vulpera, AND THIN HUMANS have this animation.
So Thin/Utopian Human maybe the next Alliance's ally race along with Kul'trians. While Horde gets Vulperas for sure.
I try the other (Vrykul, Broken, Naga, etc..) and none of them have it. Gilnean human have this animation,but they're just the human form to Worgens, don't count.