Yeah... this is just typical Sir Riddles.
Prometheus started out as "Untitled Alien Prequel" then became "Alien: LV-426" then became "Alien: Paradise" then became "Alien: Engineers" then finally one day... bang... "Prometheus".
Blade Runner started out as "Do Androids Dream of Electric Sheep" then became "Dangerous Days" then became "Blade Runner" then became "Gotham City" then became "Blade Runner" again after they couldn't get the naming rights from Bob Kane.