Snyder had always planned on more than one Justice League film; due to the somewhat ambiguous ending of his Zack Snyder’s Justice League, it would seem the director is sticking to the story he always planned to tell and didn’t fully adapt his Snyder Cut to a singular film.
In that same light, the director hasn’t closed the door on the possibility of returning to the DCEU to finish the story.
In the interview, Snyder claimed Batman “would have been plagued by guilt for not stepping in front of the blast that killed Lois” and that Superman “loses the will to fight.”
This understandably led to Darkseid capitalizing on Superman’s moment of weakness contributing to the loss of Wonder Woman, Aquaman, and more
“The world falls because Superman succumbs to the Anti-Life Equation, and that’s it. That’s what the post-apocalyptic world is: Superman just searching for Batman to kill him to get his revenge for the death of Lois.”“It was going to be Lois and Superman’s son. He doesn’t have any powers, and then he was going to end up being the new Batman.”Twenty years later, on the anniversary of [Batman’s] death, they take young Bruce Kent down to the Batcave and they say, ‘Your Uncle Bruce would’ve been proud if you did this.’ Anyway, something like that
The Snyder Cut director had more to say about his initial plan, including his plan for the new Batman “to be Lois and Superman’s son” and to carry on Bruce Wayne’s crusade