As James Rocchi mentioned last week in his post on the troubles facing the Harry Potter movie franchise, screenwriter Steven Kloves, who scripted the first four Harry Potter films, is not writing the screenplay for the next film, Harry Potter and the Order of the Phoenix. That film is being scripted by Michael Goldenberg, a Sundance Institute alum and playwright who cowrote the most excellent script for 2003's vastly underrated Peter Pan. Kloves is back on board, however, for the sixth film, Harry Potter and the Half-Blood Prince, and, according to IMDB, is expected to start work on that script soon.
I'm curious to see how a different writer adapting the source material will affect the feel of the fifth movie, and then how they'll bring it back to Kloves feel for the sixth. Goldenberg already showcased his talent for working with fantasy with a dark edge in Peter Pan, so I'm sure he'll do well with Harry. Besides, J.K Rowling maintains tight control over the films, and I can't imagine she'd let anyone stray too far from the tone of her books.