I heard that in past games such as 2k3, they revealed it in an IRC chat. We've already had an IRC chat for UT3, i don't think they would do another one. I think it would be cool if they revealed it by Mark Rein just making a single post here titled "demo" with a link. And he could do it at like 3 in the morning, lol.
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So how will the demo be revealed ??