It was announced yesterday evening by Warner Brothers that, due to several circumstances (better movie season, still recovering from this years writers strike), the release date for Harry Potter and the Half-Blood Prince has been pushed back to next summer, July 2009.
The good news, however, is that filming for the final two Deathly Hallows films will still begin in February as scheduled and their respective release dates have not been changed.
There are several articles online discussing this change such as the Guardian, the BBC, and the LA Times.
