Entertainment Weekly reports that Dunst will be playing a "small-town beautician with big city dreams who is trying to figure out who she really is and what she really wants as she struggles with traditional societal expectations" while Plemons will play her husband, a butcher's assistant.
Season 2 will be a prequel to the first season, set in 1979, focusing on the young version of David Carradine's Lou Solverson (still the worst name ever given to noir protagonist), recently returned from the Vietnam War.
Said showrunner Noah Hawley:
He thought he left the war behind, but he came back and here it is, it’s domestic. We will meet Molly’s mother, who was not a character in season 1 … and we’ll learn what happened to her. There were a lot of clues left in the first season and we’ll do our best to hit those.
Fargo Season 2 will premiere Fall 2016.