The mysterious filing.

Silicon Era has reported that a new trademark registration has appeared in the Japanese trademark database for the word "Zii."

Nintendo submitted the application on the 30th of October, though there's no indication of what it's for. It could be trying to block the sale of any more Wii wannabes trying to cash using similar names, or it could be a new piece of hardware - possibly even the successor to the white wonder?

Until Nintendo actually confirms what it is, expect rumours to circulate all over the place.