“...new WWII movie about Hitler with a black actor...”
>>Now perhaps a black actor portraying the leader of an elite team (mostly black) to infiltrate Germany to assassinate Hitler, that might sell. The plot fails when a white member of the team does something stupid that results in the teams being caught.
Key & Peele
https://www.youtube.com/watch?v=izh-j8KUYjs
Dirty Dozen (1967) Official Trailer
https://www.youtube.com/watch?v=ff1V6ywnWcY