Thank you so much!! I had 3 interviews with them (my POIs weren't able to coordinate for one) and I felt that I really bombed the first one, so this was pretty unexpected for me.
As for not hearing from UPenn (or Maryland for that matter), I am just going to assume I didn't get in, and try to move on with my life. It does make me upset that some departments just don't bother to inform some applicants until months later that, oh hey, in case you somehow didn't get it, you're not in. We all put so much time and effort into the applications that we send to these places that it seems like the least they could do is send us notification of acceptance or rejection in a timely manner.