I would love the roleplay.. inspiration.. like that but I don't believe this game should have racials. Should be related to items, jobs, and such, things that everyone could obtain / use with relatively little concept of lock out. I don't really mind the lock out of racial I suppose from WoW... but I think it's just nice(r) to not have that and would prefer it's a bit more unlock for all or "just play that job if you want to roleplay that concept", but yet still have that inspiration of such ideas is quite nice.
Say for example perhaps there was some demon hunter like job in FFXIV, maybe the Reaper job has a wraith form that floats or has wings. Then you might give that job that as an effect of being in that form, perhaps as an unlockable mount (/mount ability) they could use that adds flavor for them being them. Each job getting flavor like that (try not to exclude a job or "only include the cool new job"). Some of which could be share-able, depending on how and what it is (unlock unicorn on white mage, get it for everyone).
As for winged elf... I feel winged Au Ra concept art would be more .. "new", though I do like the suggest it's either a mount skill or like above it might be tied to a job skill.
I looked up the image of the wings from the game you mentioned, I think you might have a cool opportunity with white mage or paladin. Either one of those jobs getting a special winged mount could be pretty cool, like Paladin with those huge energy wings flowing a bit like Tyrael. Nice.
The naga (tideborn) is kind of neat but people would have to be okay with no pants and no shoes lol... Of course the thread focus on elves, what I might counter suggest and see what you think is perhaps a Fae race? I feel that would add better opportunity to go from elf since we already have an elf races (though a new elf clan that is more classical, non-dhamel neck, elf might be a popular addition since those are normally a popular race choice). I think the mythical final spot for race that is unlikely given what they said before, at least with the current restrictions, is going to be a highly coveted spot though.