Variety reports that Costner's next directorial and star vehicle will be the action-adventure film A Little War of Our Own, written by Dan Gordon. (Not to be confused with the Civil War book of the same name.) In it, he'll play a sheriff who tries to keep "a town from exploding into violence" during WWII. It sounds like some small-stateside story rather than your typical war piece, but the film's other lead is a German U-boat commander, so your guess is as good as mine as to how a sheriff and U-boat dude fit together.
Costner and producer Armyan Bernstein are currently casting the film, and are planning to get things going this fall. Bernstein says: "This has been a dream project for Kevin and I for years. The themes are timeless -- war, peace, and reconciliation." Could this dream project bring Costner back to his initial directorial fame? Let's hope so. We don't need another Postman.