Who is Autumn?

So we heard a new name today: Autumn. So the question is, who are they? Obviously I can't say anything for sure, but from what we've seen with the Branwen, a person's first and last name often share similarities. So it wouldn't be too far fetched to say that their surname is going to be similar, and there is a pretty major character who has a name to do with Autumn which is of course Cinder Fall.

I doubt that Cinder is working on the same side as Autumn, but I get the feeling that they are related. It would mean that Cinder could be the evil stepsister, or that Autumn is her adopted sibling whom her parents loved more etc. Either way, it seems all too suspicious that someone called "Fall" is to blame for someone called "Autumn's" condition without some form of relation.

Moving on to the condition itself. It's probably something to do with the Grimm as the inner circle made several references to the "true enemy" and right now, the Grimm are about as true as enemy as you could find.

I personally believe that Autumn's condition is similar to what caused Raven Branwen to become what she is today. An immortal Grimm/Human badass (see the post on it for more details). This would explain Raven's condition and her disappearance, and show that it can be spread.

I don't actually know who Autumn is, or their gender. My best guess would be that they are one of the other headmasters, or ex-headmasters as this seems like the type of person who would be in the inner circle.