We asked one of the community managers at the GoW2 booth, and he said, "Wait... did you see this image recently? A huge COG tag that's thick and made out of metal? Yeah, there's a big announcement about that coming out. I can't say anything about it really, but keep watching the website all weekend. And no, it's not something you can buy. It's made of metal, is thick, and weighs about two pounds."
Is Epic hiding these in the world somewhere, and there's a contest to find them? Are they items you can win based on your in-game performance like those rings they added to Madden? Is it just a huge paperweight? We'll keep watching the site, which yesterday put up a blurb about COGs. How convenient. What do you think it is?