This screenshot from developer Rare shows what appears to be an icon for its Nintendo 64 first-person-shooter Perfect Dark in an Xbox LIVE folder.
That's funny, because the game isn't out on Xbox LIVE as a re-release. It would make sense though — Rare has started bringing other Nintendo 64 classic titles to XBLA. (Case in point: Banjo-Kazooie.)
IGN contacted Microsoft about the image, and the company replied it had "nothing to announce at this time." We are following up with Rare.