Snyder’s original story outlines for JL sequel leaked and it turns out the plan was to have Bruce and Lois have a child.
Snyder's plot outlines
Superman would have been a brainwashed tool of Darkseid until the end when Batman sacrifices himself and saves the day.
"Lois mourns Bruce's death. Afterwards Superman looks closer realizing that Lois is carrying Bruce's child. "
Holy crap. This would have been the true death of Superman.