He's talking about custom campaigns made with L4D2's PC-only mod tools, which we're certain will be put to use straight away turning the game's zombies into all manner of famous people and copyrighted characters (ie: Shaun of the Dead). At least Valve won't have a proble-- hold on, what's this? "We'll have to filter them, we can't allow any copyrighted materials, so it's going to have to go through a process," Mailaka pointed out, dashing our dreams of escaping from not one, but hordes of shambling Andy Dicks.
Mailaka said that Valve is "hoping perhaps we can shepherd the really popular campaigns onto 360. And you know, if they are a paid system, perhaps that could go back to the authors. I think that would be a great story." You know what, it would -- but so would a mod where you have to avoid being trampled at Walmart on Black Friday. Hey, that sounds like a good L4D campaign: "Black Friday ... Escape or Die Buying."
[Via Hell Descent]