UPDATE: Looks like the leaked footage is legit, and kind of wasn't really "leaked" -- it's pulled from a "sound implementation demo" posted by former GRIN employee Jonatan Crafoord on his Vimeo account. You can see the full, original demo (with Crafoord's narration providing context for what originally seemed to be a lot of random footage) right here. As for the status of the project, that still remains to be seen.

ORIGINAL STORY: When Swedish developer GRIN (makers of Capcom's Bionic Commando) closed its doors last year, some former employees revealed their last project had them partnered with -- of all companies -- Square Enix for a new Final Fantasy game. While we've seen leaked concept art of this game (codenamed Fortress) before, now a mysterious YouTube poster has leaked what he purports is tech demo footage of the game in action.

In the info panel of the YouTube video, the poster claims this is "an action game set some time after the events of Final Fantasy XII: Revenant Wings, and is intended for the PlayStation 3, Xbox 360 and Windows platforms." The poster also claims that although GRIN closed down, the project is still alive, possibly at now-Square Enix-owned Eidos Montreal (and note that GamesIndustry.biz reported last September that an anonymous source said the project was still alive at another developer, too).