Darkseid will in turn make an appearance at the end of Justice League Part One, however, and will return as a central presence in the second Justice League film installment (due to arrive in 2019).
There is still plenty of time for other developments to arise in the making of Justice League Part One, but for now Steppenwolf is the most heavily-rumored antagonist, with his nephew Darkseid slated to play second fiddle.
Following director Patty Jenkins’ take on the Amazonian superheroine Diana Prince (Gal Gadot) in Wonder Woman, all eyes are likely to be turned towards Batman V Superman director Zack Snyder once more when Justice League Part One sees theatrical release come November 2017.
[Potential SPOILERS for Justice League Part One ahead.]