While many people were expecting the Prometheus sequel to be made after Ridley Scoot does “The Martian”, it’s possible the Blade Runner sequel could be done first.
Ridley Scott told Entertainment Weekly that the Blade Runner sequel is written:
“It’s written and it’s damn good,” Scott says of the Blade Runner sequel. “Of course it involves Harrison, who is a survivor after all these years—despite the accident,” he says with a laugh (referring, no doubt, to Ford’s Star Wars injury). “So yes, that will happen.” (Ford’s camp has not yet responded on Ford’s commitment to the project.)
With the Blade Runner sequel and the Prometheus sequel both written and ready to go, Scott only needs to decide which to do first.