Sure, the world will end, but I doubt it will be any time soon. Probably when the sun dies, or we've polluted the planet so much that it is impossible for living things to grow any more.
If I've counted correctly, there have been over 100 previous dates where the end of the world was supposed to happen (take a look at this list: http://en.wikipedia.org/wiki/List_of_dates_predicted_for_apocalyptic_events); what makes you think 2012 will be any different?
In 2013 I'll watch the movie '2012' and laugh.