The second big part of the season is it the real resolution of the primal story of “Homeland,” which is the relationship between a mentor and his protégé between Saul Berenson and Carrie Mathison, and that’s really the architecture of the final season, and that’s what you will see resolved by the end of the 12 episodes.
The really big idea of the season…is Carrie Mathison steps into Nicholas Brody’s shoes.
So that’s the first big part of the season.
She’s the one whose loyalties are questioned, not only by those in the intelligence community, but by Carrie Mathison herself, because her memory is so just fragmented from her time in captivity.