We'll never see something like Darkseid in a Superman movie. The whole Apokolips/New Genesis mythos are too fantastical for a Superman movie. At most, we'll get Zod, Brainiac, Metallo, Doomsday, or one of Superman's other "heavy-hitting" enemies.
It's okay, though. Darkseid was really well-represented in the Superman animated series and JLU, IMO.