Dead Rising 2: Off the Record. Though the Japanese publisher's European blog posted details of the game's release date recently -- October 11 in North America and October 14 in Europe, by the way -- the post has since been pulled. Thankfully, some quick Googling reveals that the post did in fact exist at one point.
It's always possible that the release dates were incorrect, but we're more inclined to believe it was simply posted before someone important said, "Go ahead." We've asked Capcom for confirmation, but haven't heard back as of yet.