This is an early alpha game already on Steam. I bought along with another alpha game called SNOW. Anywhose, this is basicly going to be another one of those zombie games, however this one seemed particuarly more pleasing to the eye to me than DayZ or L4D2. Here is a bloody link: http://playrust.com/
I just heard about this a little bit ago, looks interesting; however from what I've seen on youtube it doesn't look like something I want to play in its current state, I'll wait and see: 1. how much it improves from alpha and 2. If they improve Linux support (the website says it "should run on all OSs" but it's only actively tested on Windows.)