When does Tenkai Knights return?

Tenkai Knights is a 2014 Japanese-Canadian mecha anime series based on a toy line by Spin Master. The series officially aired on Cartoon Network in the United States on August 24, 2013 and in Canada on Teletoon on September 28, 2013. A second season of the series was announced to be in development but was cancelled prior to entering production. A 10-episode prequel web-series was released onto YouTube as well as the brand's official website between September and December 2013.