Zenimax owners of both Bethesda Softworks and id Software have registered a new trademark: Hunted: The Demon's Forge according to Superannutation.
It could very well be the next project from id Software after Rage and Doom 4, or perhaps Bethesda are branching out after their success with The Elder Scrolls and most recently Fallout 3. Another possibility is that it's the online title the newly founded Zenimax MMO studio have been working on, although it has long been assumed that title would be The Elder Scrolls Online. Time will tell what Hunted: The Demon's Forge is all about.