Obsidian Entertainment has launched a mysterious new countdown site, replacing the previous homepage for the developer.
Looking at the site at this moment will show you a black background, with an image of a dragon chewing on its tail, next to the number 4. Clicking on the logo sends you to a forum which is titled Project X.
Obsidian is currently working on South Park: The Stick of Truth for THQ, but is no doubt continuing to work on this new project at the same time.
Current speculation suggests that it could be a new Dungeon Siege game and in fact Obsidian does confirm on its homepage that the game is an RPG. Whether it's fall under this franchise or not though remains to be seen.
Previous games developed by Obsidian include RPG's such as Fallout New Vegas and Neverwinter Nights.