While we’ve gotten morsels of info about the new upcoming movie - that it’s a reboot, Clark is a 25 year old cub reporter when we first meet him, it’s not an origin story - one thing that we haven’t found out yet is who he will be fighting against. Lobo has been rumored but with the news of the Supergirl movie, which is a cosmic romp, it’s possible Lobo might actually show up over there instead. Assuming Gunn makes the smart decision to not use Lex or Zod again, who do you think would be a good pick for a starter foe?
Keep in mind it’s unlikely we’ll get the more powerful cosmic foes like Mongul or the weirder ones like Terra-Man (though I’m sure Gunn would love to bring in some of the weird ones or have them cameo).
I would go with Metallo. I love Brainiac but I think starting Superman off with another alien invasion is a bad idea. We saw that already with MoS, and the problem of how do you make the next threat feel just as or more dangerous than Zod almost destroying the world is part of why the DCEU failed. Metallo is a human/robot villain who is a threat to Superman personally, but not out to conquer or destroy humanity. A story where Supes is trying to prove himself as a reporter and a hero while Metallo and General Sam Lane are hunting him sounds like a good starting point to me.