I think they will present NES 6 as a super set of the Wii. What this means is that they will keep the Wii branding and extend it so people understand that the Wii line will continue. I think they intend to make Wii games forward compatible so people understand that anything branded 'Wii' will play in both NES 6 and Wii. I think they will call the NES 6 something like 'Wii Stream' to make people aware it's both a Wii and something more than that just as they called the 3DS an extension of the DS line.
I think any motion controlled game will be sold as a 'Wii' title and any NES 6 exclusives will be sold as 'Stream' titles. Does that make sense to you? This way they won't have any conflict of interest if they make another motion control game which is great they can use it to sell to the current Wii userbase and sell both Wii hardware and NES 6 hardware at the same time. I believe they'd want to make the migration from the Wii as painless as possible.
So I predict when you go into the stores in 2012 you will probably still see the familiar white boxes for Nintendo Wii and you'll also see some blue boxes with 'Stream' branding. They will use their marketing to make it clear that the NES 6 is still a 'Wii' but it is also more than that.
Edit: At this point I think they'll call the new console something like 'Wii Stream' if Stream is indeed the name they use for the NES 6.
This is basically my dream scenario for Wii since it means continued support for about 2 more years.