I guess he's gotten a taste for revisiting his past, what with Prometheus and all.
Listen, I agree that people are too gung-ho to revisit classics (not that that's a new thing...check out 2010 and the other other King Kong), but there's nothing in Ridley Scott's repertoire to suggest he's capable of some sort of Episode I/Alien 3 level atrocity - as long as the studio leaves the film alone (Kingdom of Heaven) and he's not taking too many hallucinogens (Legend...at least, I assume hallucinogens were involved in the making of that movie).
Anyway, this'll be a tough movie to knock out of the park, as it were. With the original Scott had the fortune of it developing a following from nothing - and that "under-appreciated film of the year" cachet. Now he's trying to follow up a classic with a rabid fan base. That's tough.