I guess I misread what Spak-Spang was saying. I read it as a new OS for the 3DS *and* the Wii U as being what NX will be. But to answer the question, Wii U and 3DS have completely different architecture. Sure if they made a new console that had similar architecture as the Wii U, then they could do an OS upgrade on the Wii U (or just do the same OS with a different look on the new console) to make games compatible with both consoles, but that seems extremely unlikely. Sure that would be possible, but the new console would either have to be yet anther extension of the tired GameCube architecture, or again, CPU emulation on the new console. After all, that's basically what they did with the GameCube, Wii, and Wii U, as well as the DS and 3DS (same hardware architecture, not emulation).