ABC Family is going to have a "Harry Potter Weekend" during their 25 Days of Christmas which will feature exclusive footage of HBP. The footage is going to be of a "behind the scenes" nature and is to take place sometime during the airing of the first four Potter films the weekend of Dec 6th.
Here's the specific schedule...but make sure you check it out! I'm fairly certain you can't find this footage anywhere else, so it's worth watching for...plus, who would mind rewatching the Originals!? 25 Days of Christmas Schedule