I couldn't find anything on the web that said she was leaving, but that seemed like an exit episode to me too. The burning of the loft made no sense; the point of it was to convince Card that Michael was dead -- and he was convinced, for about five minutes of screen time before Michael put a bullet in his head. It looked like burning bridges as well as the loft. And why kill off Gray? He was an interesting character, and that scene he played with Maddie in their first and only face-to-face was strong stuff. That was good television, but it was still another exit. And Michael's going to be a hunted man again; maybe he won't be able to get out of this one.