Hah I think by now everyone pretty much knows I am all for Arakkoa. I came up with a ton of different ways they could become a playable faction but to shorten things up I will just say I think they would make a great neutral faction. The questline in spires opened up communications with the horde/alliance and they have power and technology both factions would find useful. with Skyreach pretty much in ruins and the Iron hoard breathing down their neck I don't think it would be too much of a stretch to say that the Arakkoa would probably want to seek allies from our two factions.
I don't know who the faction leaders would be. Perhaps Anzu and his mate, however unconventional that may seem.
Also I think that with the connection many of them have to Anzu they may even have the chance to become druids, which would be nice. there are so few druid options in the game and if they were neutral you would not have to find a second race to balance out the availability between horde and ally.
To be honest I have a lot of OCs that would make perfect Arakkoa (one of them even being a plucky avian engeneer!) so i have a bunch of names reserved just in case. >.< I would probably have to race change my main as well if they became playable.
I wouldn't mind the Jinyu either. I was kind of surprised we did not get them when they were relevant but i guess if ally got Jinyu then Hoard would have to get Hozen and those guys would probably be harder to animate and properly outfit with xmog.
Basically I want another beast race that breaks the commonly seen mold of "cat man" or "lizard man"
Don't like Quillboar and don't think Mogu would ever be humble enough to join anyone.
Not a fan of saberon or ogers either but in all honesty I was surprised we did not get them at the start of Wod. Thought it would be the perfect time for the ogers to come in. Also did not expect Blizz to make the Saberon more of a "pest" race. thought we would atleast get a faction and quest hub from them.
as for sub races, i don't think they should count as a "new" race but as a much needed customization option to existing ones.
