I really hope this is not a Wii HD. Nintendo needs to deliver on the current product that has sold to 67m people before forcing them to buy a new console all over again.
If it's a DS 2, I'm more okay with it. Although I would wonder why anyone would buy an XL if a new DS is right around the corner.
An inner part of me hopes it's something completely new and unique that doesn't interfere with the Wii/DS business. Perhaps Nintendo is making a tablet? Or perhaps they are making this thing: