OH MY GOD!!!!!!!! This is the most amazing news ever, I am going to loose myself to this damn thing.  Check out some articles from Kotaku and IGN for hands on impressions, it will only cost 800 MS Points ($10) and might get future DLC in the way of maps and weapons if it does well.  You will also be able to play co-op and counter co-op online and I am sure leader boards will pop up as well.  Can, not, wait! I will see you in the Facility, holding the bathroom, sometime in March.