How big will the next Twilight film be? Tickets to Eclipse, the third installment of the saga, go on sale Thursday at midnight on the sites of online ticketers Fandango and MovieTickets, six weeks before the film’s actual release. Tickets also went on sale six weeks ahead of the release date for Sex and the City 2, which opens May 27. (Major theater chains won’t be selling tickets at the door till closer to opening weekend.) This edition of the vampire romance promises more action and new characters, as well as more baffling acts of tween fandom.