Cure centers on a young Carl Jung who uses Sigmund Freud's "talking cure" on a young and troubled Russian woman. In the process of psychoanalyzing her, he falls in love with her. Freud comes along, marvels at his success, and anoints him his psychiatric successor. When Jung starts to develop his own ideas about therapy, Freud isn't too happy, and their professional relationship sours. DHD says that the producers have promised "lots of spirited sex" which Cronenberg has always filmed rather well, so no surprise there.
Mortensen and Cronenberg have two excellent films under their belt, and there's no reason to sneer at a third. (Or a fourth if they ever make that Eastern Promises sequel.) I'm eager to see Mortensen work with Fassbender and Knightley (who both rank among my favorites) and the two method men should really fire up the screen. It's going to be good.