When Marathon is revealed, it could be another DOOM scenario where they'll just announce it at the same time it goes live. If only there were a major upcoming event where they could pull something like that off. But in all seriousness, the USK, like the ESRB, doesn't just make games up. They've been known to leak info early ... but not make stuff up. Considering it's already been privately rated by the board, we'll see what's going on with Marathon: Durandal relatively soon.