I've really got to remember that Lupin in this game is the werewolf-like race and not the master thief of anime....
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More than likely, if Viera became a thing in XIV, they'd take the Highlander or Elezen model (at least for females - probably do Midlander model for males if people would like the females taller), and slap on bunny ears and a cotton ball tail. They already said they would not do Viera-requests feet or hands because they don't want to go back and modify all existing gloves and shoes.
I personally would like more character customization for our existing races. Since 4.0 brought no new race and no updates. It made me sad. :(
There are quite a few head pieces have molded ears for miqo (and I think Lala?), but not all. With Viera and the full-helments, they could always make the ears just go flat underneath the hat vs. molding insanely long ears onto the head pieces.
http://vignette1.wikia.nocookie.net/...ht_Artwork.png
I don't think we'll get any "less human-looking" races because - as well as the programming side of it - it complicates the lore. One of the big plot points of ARR is the divide between "men" and "beastmen", and the visual difference seems to be whether races have a human-like form or not.
ARR has enough slightly-jarring dialogue that doesn't account for race already. Playing through that early part of the story as a beastman race would be very strange for a new player who didn't know what they were getting into.