Anyone read the book by Cormac McCarthy? Viggo Mortensen has really been on a bender lately with dark, disturbing movies (A History Of Violence, Eastern Promises). If this film is anything like the novel, it's going to come off like an updated version of "The Stand" mixed with the 1983 movies, "Testament" and "The Day After".
http://www.youtube.com/watch?v=hbLgszfXTAY