Outlast was first announced for PC and although it's now also coming to PlayStation 4, Steam is indeed where it will release first. Developer Red Barrels has confirmed a September 4, 2013 launch for the survival horror game and sent out a few new screenshots. Put a shirt on, dude!
Apparently the game was scary enough that a player at E3 fainted during their demo. And Outlast made Peter Molyneux jump a bit! As someone who enjoys being scared, I'm eager to try it out for myself -- especially knowing that you play as a camera-wielding reporter, not someone with extensive combat experience. The asylum's inhabitants look suitably creepy.