I will be disappointed if this new product turns out to be something to do with online gaming. Unless its really awesome, which it probably will be, since its Nintendo.
Im going to take another wild guess. It will be a controller/gaming device that you can take anywhere, all you need is the controller. When you 'turn on' the controller, a screen appears out of nowhere, like a hologram in the air in front of you, and that's the 'screen' you use to play games on. You insert mini-cds, or cartridges (games) in a slot at the top, or at the back of the 'controller/console'. It plays GBA games, GC games, and maybe games of a new type designed specifically for that device.
Just think how cool it would be when your in class, the teacher wanders out of the room, and everyone pulls out a controller from their pocket and screens appear out of nowhere, and you all start playing Nintendo games. Maybe even wireless multiplayer gaming could be incorporated into it somehow, wow my head just exploded with possibilities.
Would that be cool?