Considering the development and resource cost manpower-wise, as well as the patch update before the new expansion, we only had enough for one race. The players have wanted Viera for a long while now and the community was quite enthusiastic about it. If we didn't add the Viera at this point, the players would have been quite disappointed, so now was the best time to do it.
With FF12, there are only female Viera appearing in the game. Due to that, we have no design references for the male versions. If we did create a male design for the Viera, he would be quite elegant, handsome, and slim. He would look more like the Elezen race, but with bunny ears.
What we were missing from the lineup of playable races was someone who looked more powerful and laser-focused on battle, while looking quite fierce. Implementing that kind of race, the dev team could bring more kinds of enrichment to this type of fantasy game. To fulfill player feedback as well as the dev team, we put the two races together.