Ooo. Good find.
I, too, read A Simple Plan (better book than movie) and recently polished off The Ruins. I thought that the book was fabulous... My boyfriend picked it up at the airport for horror pulp trash to read on his flight, but was pleasantly surprised that it actually had substance... Good to find an author who can come up with a good, exciting read, that's also well-written.
I found the movie teaser on YouTube.
IMDB entry.
Honestly, the teaser leaves me with doubts... I enjoyed the book, but I have a feeling that this is going to be really sensationalized. And there were portions of the book that I thought were a little silly, far-fetched, and over the top... I worry that the movie will make it worse.
I will wait until I see more previews.