Peter Quinn's discussion with Saul near the end of this episode has me wondering about what has him so upset that he wants out after this 'case' (other than killing the child). Quinn asked what are we doing here more than once during that talk.
You'll rememeber that Quinn also decided not to kill Brody last season. Along with that, we still don't know who leaked Brody's confession to the media either. At the time, I automatically figured it was the terrorists. But, now that I think about it more, it may have been the CIA. If so, they already know that the recorded confession was for the aborted assasination attempt on the VP -- and NOT for the CAI bombing. They could have released the recording in an attempt to kill Brodie during the manhunt to finish what Quinn didn't want to do -- meanwhile protecting the agency. Throwing Carrie under the bus could be to protect her as well as - you guessed it - protecting the Agency.
If I combine those points and Saul's increasingly bad mood about his role protecting the agency, a lot of what' we've been watching may have been created by the CIA (and Saul) - all of it put into play to protect themselves. After all, they already know about Brody being turned and yet they didn't tell anybody.
We'll see I guess.