Set eight years or so after the TV show's conclusion, the movie brings back all the characters you love and/or hate. Notable additions to the cast seen (ever so briefly) in the trailer include Jamie Lee Curtis and Jerry O'Connell. Rumors of James Franco being in the film will have to remain just that.
Check out the trailer, and try to keep your excitement inaudible so you don't disrupt those around you. We've already failed at that.