David Yates, who will be directing Harry Potter and the Half-Blood Prince starting in September has commented that the next movie is "...less intense on one level. It's more sex, drugs, and rock 'n' roll."
Both Daniel Radcliffe and Emma Watson comment on his directing skill of Order of the Phoenix and the fact that he is coming back for a second time.
Daniel on working with David:
I think he managed to take the charm and visual flare of the earlier films and add his own sense of grit, that perhaps was not there before. He is a delightful man, very soft-spoken. Yet I have never been pushed as hard as I was on this film, partly because of the nature of the story, and partly because of his directing.
He always wanted me to go deeper.
The word I most connect with David is truth. He always wanted to find the truth in all the characters and in every single performance. We relished that. It stopped us getting complacent the fifth time around.
It was really lovely because David listened to what we had to say about our characters. He was respectful of the fact that we have been playing these people for five films now.