From what we saw in the trailer is like she changes her mask while she fights. Not if she could do different combos or stuff depending on the mask, because it changes all the time. I don't know. We sure need to check out her movelist, normal moves, command moves, etc. But judging for the trailer it doesn't seem to be a stance character to me... You never see a different stance, she is always in the same neutral pose, which is very similar to her render's pose. But yes, the leak was very accurate on everything. So, let's see. I could be wrong.
Very interesting interview, with pictures of online menu screens.