OnNintendo.com has posted two images — snagged from NintendoGlobal.net — of an unidentified Mario title. Of course, since these images are unidentified, they are likely fake, concocted by an overactive Photoshop buff.
It's worth noting that copyright tags have been pasted on the images, accompanied by resolution values. The tag on the image to the left reads: 2006 Nintendo 480i; to the right: 2006 Nintendo 480p.