I really want to see this one. Sightseers. From executive producer Edgar Wright (Shaun of the Dead, Hot Fuzz, Grindhouse) and directed by Ben Wheatley (Kill List).
My recommendation is to watch only a portion of the preview as I feel it showed too much but this is on my list to see.
Sightseers is listed as a comedy but definitely on the darker side.
Release date for UK - November, 2012. Not sure when it will be released in the US