I do not however for one second believe that this indicates a death to the Wii brand, more I think Nintendo could use the Wii name to augment the new system. Something akin to the following could be possible.
NINTENDO 6 with Wii Plus
N6 with Wii Plus
ARMAGEDDON with Wii Plus
by doing so, huge gaming brands such as Wii Sports, Fit, Play etc will continue without losing what is arguably the biggest defining aspect of their name, people know what Wii means, they know that in Wii Sports they are moving, Wii IS motion controlling. But by augmenting the name with the Wii brand rather then flat out labeling it that, all consumers should assume that the NINTENDO 6 or whatever elses it is called, is not ONLY motion gaming.
I cant see the system launching this year, I'd anticipate an early to mid 2012 launch, so as to allow the development community, especially the western one, to prepare more thoroughly and with hopefully more thought and polish then usual.