Once upon a time Sega had an Aliens RPG and an Aliens FPS. The Aliens FPS became Aliens: Colonial Marines; the Aliens RPG was canned.
The RPG was in development at Obsidian Entertainment (Knights of the Old Republic 2, Fallout: New Vegas) and was apparently "ready to ship".
A video of that Aliens RPG has emerged that shows various animations from the game. The video, by character artist Danny Garnett, named the game Aliens: Crucible.
The Aliens RPG was to be for PC, PS3 and Xbox 360. It was announced bloody ages ago, in 2006.