The Green Inferno (2013)
From Eli Roth. I've never really seen any of his movies I don't think, but this one looks intriguing to me because I've actually been to the Amazon river in Peru and met some of the indigenous people there. This also makes me think of Mel Gibson's Apocalypto a little bit, and I really enjoyed the setting in that film. This was supposed to come out last year, but it had some financial issues, I think. And I think it sparked some controversy because of stereotyping these sorts of tribes unfairly; not sure if that had anything to do with why the release has been delayed until this September, though.
Anyway, there's a bunch of trailers for this it looks like, but I just picked one that didn't show very much...