The date of Harry Potter and the Half-Blood Prince release is 21 November 2008. But now we can see the trailler.

[youtube="http://www.youtube.com/watch?v=sBGbKCm_pQQ"]

Plot:As Harry Potter begins his 6th year at Hogwarts School of Witchcraft and Wizardry, he discovers an old book marked mysteriously “This book is the property of the Half-Blood Prince” and begins to learn more about Lord Voldemort’s dark past. | full synopsis (warning! may contain spoilers)
Plot Keywords:Love Triangle | Fictitious Sport | Dark | Revenge |

Daniel Radcliffe … Harry Potter

Rupert Grint … Ron Weasley

Emma Watson … Hermione Granger
other cast:

Julie Walters … Molly Weasley

Helena Bonham Carter … Bellatrix Lestrange

Alan Rickman … Severus Snape

Bonnie Wright … Ginny Weasley

Jessie Cave … Lavender Brown

Tom Felton … Draco Malfoy

Jim Broadbent … Horace Slughorn

Maggie Smith … Minerva McGonagall

Michael Gambon … Albus Dumbledore
Evanna Lynch … Luna Lovegood

David Thewlis … Remus Lupin

Warwick Davis … Filius Flitwick

Robbie Coltrane … Rubeus Hagrid

Timothy Spall … Peter Pettigrew
and more