I reckon we might get an answer soon, if they introduce Viera in the new 24 man raid, then we will know which version we will get. I prefer two have 2 clans, 1 is the Ivalice Viera and the other is the smaller one. If SE is not going to add new faces, horns etc, then they might aswell spend some resource on the new race and make it very good.

Personaly, if I had to pick a type of Viera, then I would pick Ivalice Viera.