Marvel's Avengers: Age of Ultron trailer- Who is This Woman?

Well last night during the college football championship game Marvel debuted a new trailer for Avengers: Age of Ultron. There were a few new scenes and some more expansion of scenes we saw the first time around- all of it looked great. What caught my eye especially was the quick cut to a scene showing a black woman in a cave.

Not sure who this mysterious woman is. A few folks are guessing that it might be Black Panther's sister, Shuri. With the Panther set to appear in Captain America: Civil War and Wakanda seemingly playing a large part in AOU it certainly is possible.