When you cast Jason Momoa in a superhero movie, there’s no way he’s not one of the super-powered characters. You don’t waste a muscular guy like that with reasonable acting chops in the role of a rebooted Bob the Goon.
Every writer at this stage is guessing, and most are guessing Doomsday because it’s a name known to the public.
I’m thinking Ares. And that’s how you bring Wonder Woman in.
Spitball some ideas in comments below.