I'd say there's a high chance it's an original demi-mammalian race.
Medium chance it's a bunny race (not Vierra but XIV's original version).
Low chance it's a demi-reptilian/dragon/demon race with horns.
Very low chance it's a XIV version of Bangaa/Ronso or any other previous FF race.
Very low chance it's a mix of existing races or new clan of existing race.
Virtually no chance of full mammalian or full reptilian (based off standing posture in pic).
Virtually no chance it's actually Vierra (so stop saying "I hope it's Vierra??").

On a side note, it would be nice to have this race be between Miqo'te and Lalafell in height. Roegadyn>Elezen>Hyur>Miqo'te gradates pretty evenly down, but suddenly drops down for Lalafell.



Personally, I'd like an original race. I don't mind a bunny race but I hope if so, it's visually different enough from Vierra to come into it's own.