Categories Trailers Trailer: Harry Potter and the Half Blood Prince Post author By Ambrose Heron Post date 19/11/2008 The first full length trailer for Harry Potter and the Half Blood Prince, which opens onย Julyย 17th 2009. Tags harry potter, harry potter and the balf blood prince ← Interview: Bernd Eichinger on The Baader Meinhof Complex → Behind the Release: Body of Lies