What movie trailer is this?

A handheld camera is taken by 1 of three or so characters who are in a field and they go over to something that they have found sitting in a puddle. It is an unrecognizable life form, either an alien or a cross of two species. I think it was played last year or early 2011. I thought the title had something to do with Roswell or Area 51, but I can't find anything on it.