This just in from Rope of Silicon:

The upcoming DVD and Blu-ray release of Harry Potter and the Half-Blood Prince contains a 50 second sneak peek at Harry Potter and the Deathly Hallows.

The video includes brief introductions from David Yates and David Heyman, as well as behind the scenes footage and the 50-second long teaser to the film, centered around the three hallows.

Harry Potter and the Deathly Hallows is being released as two movies. Part one is due out at the end of next year.

Drum roll, please.