According to an updated cast list for Harry Potter and the Order of the Phoenix, Dario Marianelli will be the composer for the film. Mr. Marianelli recently worked on V for Vendetta, Pride & Prejudice and The Brothers Grimm.
IMDb has been wrong before (the site's information is based largely on user submissions) and there has been no announcement as to whether or not John Williams will be reprising his role, so please treat this as a rumor until confirmed.
UPDATE: HPANA has learned that Nicholas Hooper will be the film's composer.
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