User blog comment:Emilios1310/New Call of Duty Trailer about customization!/@comment-75.22.68.201-20101002231357/@comment-173.50.182.184-20101002233025

actually that makes me think its just a campaign. i find it unlikely that there will be any type of harmful gas effects in a zombie mode, unless of course its a trap like the electric field. sounds a bit more like something from a story based thing to me though