However, it’s possible the Justice League reshoots may altered Darkseid’s involvement, and one report even claimed that the setup for Darkseid to be Justice League 2’s main antagonist has been removed.
So for now, we’re still in the dark of how Darkseid will directly play into Justice League, and that’s if he even appears.
Rather than follow in the footsteps of Geoff Johns’ “Origin” Justice League arc (i.e. the story that kicked off the team in the New 52) and have Darkseid leading the invasion of Earth, the Justice League movie decided to send Steppenwolf, Darkseid’s uncle, to our world with the Parademon army.