The next game from the Penumbra team
...and that trailer is freakin' awesome/terrifying (turn your speakers up before watching if you can )
I never did manage to get through much of Penumbra - it's something I have sitting on the shelf that I keep meaning to get back to at some stage, though if I'm honest I'm not a huge fan of not being able to fight back in survival horror type games. $20 for the online version ($16 if pre-ordered*) means I'm more than willing to give it a try at least anyway.
If nothing else their sound design and physics model is damned impressive for a low-budget developer.
*Apparently if they get at least 2000 pre-orders before 31st of May they'll throw in some extra content as well.