That's anybody's guess. The Potterverse produces several prequels (Magic Beasts and Where to find them), but these deal with events long before Harry's birth. JK Rowling, the book's author, published Harry Potter and the Cursed Child as a play, creating expectations about bringing it to the silver screen. However, that's unlikely. While the characters in that new work are the same as the classic seven books we loved, the context is entirely different. As far as we know, no ninth Harry Potter movie is in the works, and it's a very doubtful proposition.