Its definately a character we have never seen before. It would be to much of a let down to make it a previous character form kotor. Think about it, if were revan vrook, bastilla etc how happy would you be with that scenerio. I'd be devestated. Lucas arts know that, out with the old in with the new.
I can say that its a man judging from his hands, unless its a female chinese swimmer. He's human, and of normal human size. And he has some sought of connection with atris like bastilla and revan had.