Deleted scenes, outtakes, some documentaries... if these things interest you then it might be worth buying it. If not, then stick with what you have. The only difference is the certificate. The original is a 15, the new version has a 12. In order to change the certificate then somehting has to be new about the film. They simply could have changed the style of the end credits to get that, it doesn't necessarily mean something has been added.