Thanks for the post Ferne and thanks Anonymoose for the thread, Catapult, Warlock, Zenaku and others who have gathered information and posted things that brought up great discussion topics. Now we can sit and discuss what happened to the male Elezen, maybe the Miqo really did 'grow weary of the company' and mpk'd him.

What I have been allowed to say is, the Sanguine Sirens are different from the sirens which are mentioned in the blacksmith/armorer class quests, and both are different from Siren of Final Fantasies past (who has not been mentioned in-game). And then there's the provisional artwork that was recently released...

So wait, does this mean there is no Siren primal? Well, that remains to be seen.
Wonder which artwork is in question.

Oh well, now to watch Cutscenes and look for shadowless people.