I saw a trailer a few weeks ago,its about some men that are trapped somewhere,they have all had there memories erased and don't know who are the kidnappers/convicts/ murderers and who are the hostages. Please help! I'm pretty sure its out now or very soon on dvd.

It's Unknown (http://www.imdb.com/title/tt0450340/). I saw it on a flight to Seoul, of all places.