Here are the first details, via Telltale:
You’ll control protagonist Jesse throughout the season, as portrayed by actor Patton Oswalt. Jesse and his group of friends revere the legendary Order of the Stone; four adventurers who slayed an Ender Dragon. The Order are the very best at what they do: Warrior, Redstone Engineer, Griefer, and Architect. While at EnderCon, Jesse and his friends discover that something is wrong… something dreadful. Terror is unleashed, and they must set out on a journey to find The Order of the Stone if they are to save their world from oblivion.
The season will feature Patton Oswalt, Brian Posehn, Ashley Johnson, Scott Porter, Martha Plimpton, Dave Fennoy, Corey Feldman, Billy West, and Paul Reubens. Look for further casting details to come!
Watch the trailer below.