Scott and writers Damon Lindelof ("Lost") and Jon Spaihts ("The Darkest Hour") go back to explore the future world of "Alien," only 30 years before, with a bigger budget and better technology, as a space team (Charlize Theron, Michael Fassbender, Guy Pearce, Idris Elba, and Noomi Rapace) search for the origins of the universe. They do not like what they find. The film's ultimate goal is "to scare the living shit out of you," Scott said at Comic-Con via satellite from Iceland.
In his 70s, with three Oscar nominations, Scott is one filmmaker, like "Aliens"' James Cameron, who can both tell a story and deliver high-end performances and visuals. His skill set encompasses all the areas moviegoers seek and so often do not find. That doesn't mean Scott doesn't fumble occasionally; he's still a victim of what the studios will actually finance him to do (see "Robin Hood"). Scott has also signed up to produce and direct a follow-up to 1982's "Blade Runner," maybe his best movie, which influenced generations of sci-fi films to come.
More 'Prometheus" plot speculation here.