Ridley Scott's prequel to Alien is rumored to feature the enigmatic Space Jockey, and concept illustrations of said elephantine creature have appeared online. It's unconfirmed if this is official art, but these doodles are nonetheless intriguing.
These designs were sent to Script Flags by a reader claiming this is from Scott's upcoming alien film. Still no word on whether the space jockeys' tenuous grasp of the human anatomy will lead them to mind-control two male astronauts into mating.
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UPDATE 11/26/10: Looks like it's fan art (albeit extremely cool fan art).