The film has been in production before US forces actually killed Bin Laden so The Hurt Locker director had to recraft the script. There were also some allegations that the Obama administration has been illegally sharing classified information with the filmmakers about the actual operation. This may force the release date to be pushed back until after the next federal election.
Joel Edgerton was at one point cast in the film but dropped out over scheduling conflicts. There have since been rumors that Tom Hardy, Guy Pearce and Idris Elba were circling the film. As Twitch points out, Pratt is the only American of the bunch, which is interesting. Producers are now aiming for a February start to production.