Those of you interested in this sort of thing may remember that recently Veritaserum had posted some clips of camcorder footage on the OotP set at King's Cross (Mugglenet and TLC then linked to Veritaserum). WB asked them to pull the clips, but they made it up on YouTube.
Below is a link to the clips. It doesn't show much, so no spoiler warnings are needed, even assuming anyone on my f-list has yet to read the book.
Harry Potter and The Order of the Phoenix Clips