Johnny Depp and Geoffrey Rush has confirmed their roles as Jack Sparrow and Hector Barbosa respectively. Orlando Bloom and Keira Knightley have not confirmed or declined their roles. They both say that they feel their roles have completed the stories but I'm guessing that for such a big movie, if the stories somehow change the actors minds, they'll probably reprise their roles once again.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.