The Nintendo Fusion is unlikely, but something like it may yet appear in the future.
There's a Nintendo Direct coming today that MIGHT elucidate more on this (though I doubt there'll be any actual new hardware announced), but for the moment I'll just leave this here:
http://www.ign.com/articles/2014/02/03/ ... d-platform
The Wii U will likely remain; this information is just regarding what they have planned for future hardware. It seems like their goal is to more easily port software between devices, and I hope and assume that this will include from Wii U to its successor. Those who plan to purchase Wii U games on the eShop would like this very much, as it would mean the transfer of digital content between devices at little to no cost and with no extra development time unlike with Wii VC games to Wii U, or Wii games to 3DS.
Honestly they're quite behind on coming to that conclusion but I guess that's the downside to being such an introspective company that doesn't tend to think to copy what others are doing. My only concern is if the necessary similarities in hardware architecture between devices will limit how they may plan to innovate with their devices in the future. Though perhaps they don't need to innovate much further—they have Wii Motion Plus and a Gamepad with a touch screen. Once they sync that 3DS, what else is there to do? Upgrade? Drudge up their Virtual Boy days, and give the Oculus Rift some competition?