Frictional Games, the development team behind the interesting Penumbra horror-adventure game series, have been working for some time on their next project. Previously the game was under the working title of Unknown. Now the developers have revealed the official title of the game: Amnesia: The Dark Descent.

They have also launched the game's official web site and posted up a brief gameplay trailer via YouTube which you can check out after the jump. As one might expect from the title your playable character is apparently put in a situation where he doesn't know who he is or how he got into a strange home. The game is due for release for Windows, Mac and Linux platforms sometime in 2010.