Patton Oswalt is not only a very funny fellow, he was part of one of the real standout episodes of "Dollhouse".  Apparently he is writing a one-shot Serenity sequel comic:

Post-'Serenity,' a bunch of Wash's friends who we haven't met on the show, they're basically buying a new ship and christening it... It's called a 'float-out' when you christen a ship. As they're christening a new ship, they're telling stories about Wash, and we're basically seeing what could be the start of a new adventure.