There are 15 in total which means that if the film is a hit, Warner could have another successful franchise on its hands (to go along with HarryPotter and Batman).
Now, having been stuck with the library shtick, she has to go on working the stacks in the HarryPotter movies, while the kids who have since come of age nudge their parents.
Many have suggested that the only solution for publishers is to re-imagine themselves as Hollywood studios and go fishing for blockbuster hits such as the next HarryPotter or Twilight series.