footage from the last two Harry Potter films, along with footage from a few other upcoming films Warner Brothers is producing, will be shown at ComicCon 2010, a convention that occurs annually.
However, Warner Bros announced online today that none of the Harry Potter actors will be attending the event. The Harry Potter part of the convention is slated to begin at
11:45 am Saturday morning,
And finish around 1:45 that afternoon.
If the footage from the convention does get released online,
You can be sure to find it here soon after.