Yates Plans Harry Potter VI: Half Blood Prince
Something to look forward to before you read the Part Seven spoilers...
"It's about the kind of emotional and sexual politics of being a teenager," said Yates. "It's a very different swing, the next film. I think it needs to be for the series to keep evolving. In my work, every choice I've made, I've always gone for something in the neurotically opposite direction. Once I've finished something, I've stayed keen to stay fresh as a story teller to try something different. The Potter world is so rich. They're so many things to play with in that world that it's possible to regear so the next one will be very different I think."
So you see, even wizards have the same problems we do. "One thing we said when we finished Order of the Phoenix was that we want a very different experience next time around. We're very proud of this film, the intensity, the emotion and everything. One of the great things Jo Rowling does in the book is that she captures stages of childhood so the next stage of childhood is a bit more sex, drugs and rock and roll."
That is, without the drugs.