The Goblet of Fire director Mike Newell has given one of his first interviews since filming began, giving fans a sneak preview of what's to come.
He talked about the difficulties of making the fourth movie different, yet still fitting in with the other films.
"What you do, is you pack it with references ...taken from the book," he told film magazine Variety.
Newell also said the costumes worn by the French girls in the films "drive the Hogwarts boys absolutely mad".
Despite the success of the previous Potter films, Newell said he was not worried about what fans would think about his film, and paid tribute to Alfonso Cuaron
He said he was surprised when he saw the third film because Cuaron had already done some of the things he wanted to do with the fourth.
"Of course, what I had wanted to do was introduce the darker adolescent tone myself and found to my horror that Alfonso had gotten there before me and with great style and determination," said Newell.
The director also said that by the end of the film the characters are truly matured.
"The children are growing up, and that's what the basic story is. You have to be true to growing up in an abstract way and to these kids in a particular way."
Filming on the fourth Potter movie started on 25 June and is scheduled to be in cinemas in November 2005.