Viera were a race from Ivalice. If they were even considered to be implemented in XIV they would have a name change and most likely have their look altered to be more human Like all the races have been.

Personally I think the Ivalice races should stay on Ivalice. the reason it was acceptable for the XI races to be rehashed for XIV was simply because you can state that XI and XIV are in the same universe but different worlds. Ivalice is a completely different universe though.