After writing the script, Rian Johnson made this pitch reel using clips from other movies to give studios an idea of the movie's tone, and show them how a story like this could be "presented in a clear and compelling way in the marketing."
Trailer for the third? Fourth? The Fourth movie in the "Underworld" series. Though the previous entries in the series weren't what anyone would call good, more more Kate Beckinsale is never a bad thing.