With the fifth season in production, producers are definitely digging deeper into A Song of Fire and Ice series.
As reported by Blastr, actress Keisha Castle-Hughes has been currently cast as one of the late Prince Oberyn Martell’s daughters. No specific news on which daughter she will play (Blastr also reports producers are focusing on 3 of the several Martell daughters) but it is speculated she is most likely to play Obara or Nymeria.
With little knowledge of her acting and little news of her character she looks like a definite Dornish princess to me. And you can well say that there will be some intense drama in next seasons episodes seeing as the daughters of the slayed prince are being cast.