Live chats break the mold of BD-Live, typically a service used to push additional products on users. The Harry Potter and the Half-Blood Prince Blu-ray will feature star Daniel Radcliffe and director David Yates in a live chat while the movie plays, answering questions provided by visitors on December 12th. The Blu-ray streets on December 8th, giving viewers a four-day lead time before the chat.
Note the chat is limited to 100,000 users who RSVP the invitation of the Live Community Screening. The chat takes place at 3PM EST. This is a one time event, and Warner, according to their FAQ, will not offer transcripts.