Following on from the recent news that Prometheus 2 is definitely happening at some point, Ridley Scott has been speaking to Empire further about the sequel, not to mention a Blade Runner sequel.
The director said:
"Prometheus 2 is written... Prometheus was a great experience for me. Chasing number two, we can start evolving the grand idea."
As for Blade Runner 2, it appears that it's in the work, but again there's nothing set in stone of a start date. Scott said:
"Yeah, we're working on Blade Runner 2 right now - that will happen sooner or later."
In the meantime, Scott's got Exodus, his bible-epic with Christian Bale as Moses, on the way next year, then 2015 will see the release of The Forever War. That means that if either of these sequels are to move into production, it's likely not going to be until mid-2015 at the earliest.