It’s being reported that Darkseid will not be the villain for Justice League: Part One, even though he was hinted all through Batman V Superman: Dawn of Justice. In fact the villain will be one that wasn’t added to the BVS but you can see him in this deleted scene.
The scene features a demonic looking creature which is Steppenwolf, one of Darksied’s minons. He is surrounded by what looks like mother boxes, the same box we see in Silas Stone’s S.T.A.R. Labs video. This would explain how Lex Luthor knows that Darkseid is coming. If Darkseid doesn’t show up for Part One, we can assume that he will appear in JL Part Two.
Justice League: Part One is currently filming and is expected to release November 17, 2017!