The Obsidian Entertainment Website has a mysterious tease with an image of a serpent eating its tail surrounding a number four. Clicking through leads to their forums where they have Project X Speculation & Discussion, so feel free to speculate and discuss to your hearts' content. Thanks VG247.
Call of Fallsiege. Rattlehead's suggestion sounds like a more informed guess than Shack's guesswork seeing as he referenced the Ouroboros with the serpent eating its tail.