Harry Potter and the Half-Blood Prince is an upcoming 2009 fantasy-adventure film based on the novel of the same name by J. K. Rowling. It is the sixth film in the popular Harry Potter film series. It is directed by David Yates, the director of the fifth film, Harry Potter and the Order of the Phoenix. David Heyman and David Barron are producing the film, and Steve Kloves, screenwriter of the first four films (but not the fifth), has returned as screenwriter for this film. Filming began on 24 September 2007, and the film was originally planned for a UK and North American release on 21 November 2008, but on 14 August 2008, it was announced that the release date for the film was to be delayed to 17 July 2009, but this date was later changed to 15 July 2009. Unlike the previous film, the sixth film will not be simultaneously released in regular cinemas and IMAX 3-D, due to a Transformers: Revenge of the Fallen 4-week commitment. The film will instead be released in IMAX 3D on 29 July 2009.