One thing I will say is that I'm not sure about the casting of Brad Pitt. If he's meant to play tough, intimidating and all around bad ass, it may not work for him. He reminds me of Colin Farrell in that he has a macho physicality, but it's seared with a little goofiness. Pitt epitomized Achilles in Troy, but mainly because he epitomized the look and didn't have too many lines outside of the bland. He also did well in Fight Club for the purpose of his role, but the look worked for him and he was mainly relegated to a supporting role. Tarantino will make him carry more intricate dialogue and make him make more bizarre things come off as cool and tough.