If you read the book, you know what we're in for, if you watch the trailer http://www.popoholic.com/video/the-road.html, I'm not sure we're getting the book. The Road was a beautifully written story about surviving the apocalypse. The book gives nothing away as to how the end came, but the movie seems to be eluding (from what the trailer is telling us) that it is a natural disaster that brings us down.
Have a look at the trailer for The Road and tell me if you think the movie will be The Road "Lite".
I think so... But I'm going to see it anyway.