Warner Bros. Conjures Latest ‘Potter’ Trailer Wrap STaff April 16, 2009 @ 7:20 PM Share on Social Media Warner Bros. has just released the latest teaser for "Harry Potter and the Half-Blood Prince," which will make it’s domestic bow on Wednesday, July 15. Muggles, click on the poster to view the trailer. Read Next ‘The Flight Attendant’ Creator Steve Yockey to Write 'Star Trek 4' Comments