From wikipedia, "Matthew Vaughn and James McTeigue were reportedly approached, and M. Night Shyamalan also declined. Shyamalan stated that he would like to try his own hand at writing an adaptation of a book before attempting to take on Harry Potter, despite his having written the screenplay of 1999's Stuart Little."
Gave me a good scare this one. M. Night Shyamalan can't possibly direct any of the Harry Potter series - over my dead body! Dumbledore would awake from his white tomb and curse him to oblivion!
After The Sixth Sense, Shyamalan has produced, IMHO, the worst scripts ever. He may be good in directing, but please hire someone to do the storyline!
Luckily, the next 3 films of Harry Potter will be directed by David Yates, who also directed Order of the Phoenix. People often are divided between who remains faithful to be books and who is more creative and contributes more to characters development and style. I try not to be one of them because I just think there's no way of condensing 7 thick books into several hours of movies. Something's gotta give. I'm just glad getting some Potter love.
We all have a date with the cinema this November, when Half-Blood Prince makes his debut on the big screen. Yay!