If you take a look at the new trailer released today at E3 and fast forward to 1:58 you will see a young boy who does not appear to be Elezen, Hyur, Lalafell, or Rogaedyn. He appears to be a small stature hyur but has pointy ears, however not as pointy as Elezen or Lalafell, and he appears to have a horn coming out of his head.
Now, keep in mind this could be a NPC character, a storyline character, or I could just be viewing it wrong some how. I will let you make the decisions and evaluations yourself. Nothing is known for sure yet and this is just wild speculation.
Here is the "Gria" @ 1:58 in the new E3 trailer.