The World War II movie "Valkyrie" that will star Tom Cruise is still in pre-production, but just look at the cast they are building: Tom Wilkinson, Carice van Houten and Kenneth Branagh are all confirmed and, according to IMDB, Bill Nighy and Stephen Fry are in negotiations. Those are brilliant actors, every one of them.
The movie is about an assassination plot against Hitler and although we know it failed, with a cast like that the movie won't!