Date: 19th October 2018
The Harry Potter creator has been heavily involved with the Fantastic Beasts franchise thus far and that looks like it's going to continue. According to the author, she has the story mapped out for all five of the Fantastic Beasts movies.
During a recent interview, as the public awareness campaign for Fantastic Beasts: The Crimes of Grindelwald ramps up, J.K Rowling was asked about how much of the remaining three movies she has planned out. The author previously revealed that she envisions a five-movie arc, when all's said and done. Rowling confirms that, just as she had done with the Harry Potter books, it's all planned out. Though, there could be some tweaks along the way.
"As with the Harry Potter books, it is all mapped out. In fact, when we announced the five films, I talked about that. It's always possible that some details will change along the way, but the arc of the story is there. It's been an amazing opportunity to tell parts of the backstory that never made it into the original books. I'm thinking particularly of one character that I think fans will be surprised to meet in this movie."
Source: Press Release