Aliens: Crucible Footage Resurfaces, Confirmed as Real

If SEGA's removal of the leaked Aliens: Crucible footage wasn't an indication that it was, in fact, real, then Matthew Rorie's comment on the Obsidian forums certainly would be.
Just to be clear, this is from an extremely early pre-production build.

Obsidianite "Mustang" offers this caveat, too:
There's hating a game, and then there's hating a preproduction build. And then there's hating something to be in the "cool" minority of internet rebels and toughguys.

Anyway, that video sure does bring back memories!

And because it's impossible to delete anything from the Internet, you can find the clip online (again) at Shogun Gamer.