I really hope it isn't backwards compatible.
I feel like that is a step that has been holding them back. Everyone and their mother has a 3DS, and the only people that are every going to buy a Wii U have already bought one by now, so there should be no concern about players wanting to play 3DS or Wii U games on the next console.
Cross-buy is a must if
this Double Dutchess concept of Console+Handheld is true...
