What look like Darkseid's parademons have already been pointed out from the earliest Batman v Superman trailers but now there is more proof that this character may be making an appearance.
Finally an image has been released that seems to show Darkseid's Omega Symbol stamped in the dirt. This seems to suggest that he will be making at appearance at some point in the film. 
via DC Extended Universe
The Exec. Producer for Justice League, Deborah Snyder confirmed that Steppenwolf will be the main villain in Justice League, though the final casting for the role hasn't been decided just yet.
Steppenwolf is Darkseid's uncle, and also one of his most valued lieutenants. Steppenwolf's been killed and brought back to life multiple times, with the first and most memorable time being after he assassinated Izaya, the Highfather of New Genesis.
Heggra, Steppenwolf's sister was Darkseid's mother, until Darkseid went on to kill her. Steppenwolf's basically known as the undisputed military mind behind Darkseid's army of Parademons.
Who should play Steppenwolf? Check out the deleted scene from Batman v Superman, which shows us our first glimpse of the villain in action, below:
Costume designer Michael Wilkinson revealed the context of this scene in an interview with Brazilian news site, omelete.
As translated by WeGotThisCovered:
“It’s like a dream that Ben has, so we wanted to, it has almost a Mad Max quality to it where it’s like the end of the world, trying to survive and then of course Superman and his minions come, so it’s sort of a way of representing the amazing amounts of, the sort of obsessive quality that Bruce Wayne has about the threat of Superman.”
