OIC.
I am just hoping she is a mage.
If she is from Rivain, they do treat mages different there and she could be a non-combatant mage of some sorts. It seems the Andrastian countries either use mages to hurl fireballs at bad guys or lock them up
It would be interesting to see a mage who just wanted to get a job in trade.
Or not and it's just wishful thinking.
Some think she will be a Mage, particularly from the Lucrosian fraternity, since it will balance the advisers out in terms of classes, since Cullen is a Warrior and Leliana is a Rogue.
Personally I prefer if she was the only true civilian noncombatant character of the group because it would provide a unique viewpoint as well.
As for nationality, we haven't decided if we like Rivain or Antiva more for her heritage, since both are nations whom we never really got a good source of information about from somewhere other than the criminal underworld. Plus Antiva's views on women would be interesting to learn about from more than a Codex.
We're all just wishful thinking right now. All we know is she is in the game and plays an important enough part to be shown in the follower shot of the trailer.