When does A Claymation Christmas Celebration return?

Will Vinton's Claymation Christmas Celebration is an animated Christmas television special. The special is co-hosted by Rex (Johnny Counterfit), an erudite Tyrannosaurus rex, and Herb (Tim Conner), a dimwitted and bespectacled Styracosaurus with a gluttonous appetite. The Biblical Magi sing the verses of "We Three Kings" while their camels sing the chorus in the style of doo-wop.