Work has begun on a new Dragon Ball animated feature film by Toei Animation, with a planned December 2018 release date. This would be the twentieth film for Akira Toriyama's franchise. This news was announced by Toei at the annual Jump Festa anime festival in Japan.
This new, as-yet-untitled Dragon Ball film will explore the history of the Saiyan and the origin of Goku's strength. Since the previous film Battle of the Gods, Goku has shown several new Saiyan forms that had not been fully explored - or explained.
Toriyama is overseeing the screenplay and character designs for this new film.