This Gamekyo story claims that Nintendo's going to show an old franchise update at its press conference this week. Like, dur. From the piece:
Nintendo seems to be hiding some more surprises for its upcoming Japanese press conference next Thursday. Everyone is talking about a new model of the Nintendo DS that includes a camera, but what you don't know is that Nintendo has a new game to show. We can announce today that Nintendo will reveal a new game for the Wii during this event which is actually an old franchise that everyone is waiting for. Nintendo press conference will be held in Japan on October 2nd.
What could it be?