Here are shorts clips from the Firefly panel at Wizard World Philly 2013, with Gina Torres, Summer Glau, Jewel Staite and Adam Baldwin.
In the first video, the question was: "What do you think happened to your characters after the movie?". Summer Glau says: River was going to start her own business and get a boyfriend. In the second one, Adam started a round of Happy Birthday for Jewel Staite at the Firefly Panel at Wizard World Philly 2013.
The third video cover 10 minutes of the panel.
Thanks to dylangillian for the find; read more in our forum thread