"If it's true, you really don't stand a chance."

Hidden away on the Blu-ray of the newly-released Harry Potter And The Half-Blood Prince is the first glimpse of next year's Harry Potter And The Deathly Hallows Part I. It's as close to a teaser trailer for the film as we've had to date, and it's all looking very dark, with moody music and lots of worried faces.

Introduced by producer David Heyman and director David Yates, you can catch the trailer below...