New Cast Members announced
Finn Cole (Peaky Blinders, Animal Kingdom), Anna Sawai (Ninja Assassin) and Vinnie Bennett (Ghost in the Shell) have all joined the cast, no idea on what roles they'll play but from the looks of the film, it will be military based so I guess they could new Fast family members, member of Cena's team, villains, IDK.
https://comicbook.com/movies/2019/07/03/fast-furious-9-cast-finn-cole-anna-sawai-vinnie-bennett/