After releasing a number of games in its Penumbra series of horror-themed action adventure games, developer Frictional Games has now offered up some early gameplay footage from their next title. The survival horror game, which was formally announced back in September, now has a title, Unknown.

There's still not a lot of info on the game itself but the footage, posted up by the developer on YouTube, does show off some of the new physics and lighting effect Frictional Games are putting into their in-house game engine. In fact the developer plans to release the game's editing tools for mod makers to create their own content when Unknown is released. We will have to wait a little while, however. Unknown is slated for release in the spring quarter of 2010.