Thats good, but it is going to be a very long movie. I mean, the durselys and the dementors are important, everything is important, but i dont know, especially in this book, how they're going to compress it so that it makes sense and follows the clues of the books that percede it (forshadowing)
There are just so many little intricaces, it will be a challenge to fit it into a 2 1/2-3 hour movie