Coming soon... Currently receiving a lot of praise in the UK is the second feature of Down Terrace director Ben Wheatley - Kill List. It seems to be a generic English gangster movie but soon jumps into another, horror.
Other films that have successfully utilized this same move are Michael Mann's second world war movie The Keep, and of course Predator. Unsuccessfully, it would have to be Cowboys and Aliens. Personally I cannot wait to see this film.