When does Metalocalypse return?

Metalocalypse is an American musical adult animated television series. It premiered on August 6, 2006. The series centers on the larger-than-life melodic death metal band Dethklok. The music, written by guitarist/creator Brendon Small, was credited to the band and featured in most episodes. The show was canceled in 2013. A direct-to-video film has been greenlit.