New HBO Harry Potter series trailer released: Here’s everything you need to know  Yahoo‘Harry Potter’ Drops Photos of HBO’s Snape, Draco Malfoy, Dumbledore, McGonagall and More in Magical Trailer  VarietyHBO’s ‘Harry Potter’ Trailer Reveals New Cast and Surprise Christmas Premiere Date  The Hollywood Reporter‘Harry Potter And The Philosopher’s Stone’: See First-Look Photos From Upcoming HBO Series  Deadline