“Xolo Maridueña will continue playing Blue Beetle in the DCU, as Viola Davis will Amanda Waller, and John Cena will Peacemaker.” Gunn did not mention any other actors rumored to return, such as Gal Gadot as Wonder Woman and Margot Robbie as Harley Quinn.”
Well, according to Gunn, nothing is canon until Creature Commandos, but also…
https://gamerant.com/james-gunn-dcu-canon-explained-blue-beetle-peacemaker-actors/
“Xolo Maridueña will continue playing Blue Beetle in the DCU, as Viola Davis will Amanda Waller, and John Cena will Peacemaker.” Gunn did not mention any other actors rumored to return, such as Gal Gadot as Wonder Woman and Margot Robbie as Harley Quinn.”