I think it's possible that Fantastic Beasts might actually end up being better than the Harry Potter movies. JK Rowling is supplying the script, and it's a script this time, not a book. I think that will make all the difference in the world. As the series progressed the books got longer and longer, so much so that the movies had to cut a lot of things out which made the later movies feel disjointed, and hard to follow. With the movie originating with a script instead of a book, the movie will hopefully have a proper pace.