ComicCon has released the full schedule of events for the San Diego ComicCon! The Harry Potter and the Deathly Hallows scenes will be shown on Saturday July 24th at 11:45 am until 1:15pm along with clips from Green Lantern and Sucker Punch.  According to the site:

Warner Bros. showcases three eagerly awaited upcoming new films in this Hall H presentation!

Harry Potter and the Deathly Hallows — Every saga has a final chapter. Kick off the year of Harry Potter with a first look at the coming screen adaptation of J. K. Rowling’s final book in the series, Harry Potter and the Deathly Hallows, with a program created just for Comic-Con fans. One way. One hero. One destiny. Don’t miss it!

Then on Sunday, at 2:00pm there will be a Harry Potter Fandom Panel in Room 24ABC:

This summer sees the Harry Potter series and fandom slip into the future with the close of filming on Deathly Hallows and the grand opening of The Wizarding World of Harry Potter at Universal Orlando. What is the impact on the fans, fandom, and their future? Insights from Melissa Anelli (webmaster of The Leaky Cauldron and author of Harry: A History), Darren Criss (actor/composer, A Very Potter Musical, A Very Potter Sequel), Leslie Combemale (ArtInsights Gallery, official/exclusive HP art supplier), Eddie Newquist (executive producer, Harry Potter: The Exhibition) and Andrew Slack (HP Alliance Creator and Executive Producer). Moderated by Heidi Tandy (HPEF/Ascendio 2012, FictionAlley).