Serenity: The Shepherd's Tale is an upcoming comic book series and the 3rd Serenity mini-series following Serenity: Those Left Behind and Serenity: Better Days. Ron Glass announced it at the 2007 Browncoat Cruise. The series will focus on Shepherd Book's secret past.
Behind the scenes
This series was confirmed in Serenity: Better Days #1 and is currently in the early development stages, with plans to debut it before the end of the year (2008). However, as of October 2009 no more details have been released.