Some great user-submittted Wii 2 console designs:
http://wii.ign.com/articles/116/1166486p1.html
Such as
And this one, which I don't like so much for the concept art, but for the spelling of Stream.
This is ingenious. Whatever Nintendo calls it, they don't have to call it Wii 2. They just have to incorporate the "ii" in the name and everyone will know exactly that it is the successor to the Wii.