Though we are still a little less than a year from the release of James Gunn’s new superhero film, “The Suicide Squad,” it appears that the filmmaker is ready to move full-speed ahead on the film’s first spinoff, the previously announced series, “Peacemaker,” starring John Cena. With the filmmaker teasing that production is about to begin shortly, WarnerMedia is letting fans know who else will be joining Cena in the cast of the HBO Max series.