For any fans who have not read the book (What are they waiting for?!) the film of "New Moon" may come as a bit of a shock after "Twilight". omg! at yahoo! has an article in which Rob discusses the darker feel of "New Moon".
"The book of 'New Moon,' the majority of it is incredibly depressing," Pattinson told Reuters. "Obviously 'Twilight' was about finding first love and the difficulties of that, but 'New Moon' is really about loss and reconciliation, but the reconciliation isn't completely full."
Full article here