It's possible, considering Nintendo is also rumored to be mounting a touch-screen on the Wii 2 controller. They may be trying to move once again into merging their handheld and home console successes. The idea was somewhat half-heartedly attempted previously with the GBA for the GameCube, but didn't gain much popularity.
If it's true, I think it will be a flop. Handhelds and home consoles do well separately for one, largely have their own audiences, and the 3DS doesn't seem comfortable enough to be a controller either. I guess Nintendo is attempting to change gaming habits again.
Nintendo has been trying to do this ever since the SNES.
When they came out with a cartidge that you put in the slot, and you could put your GameBoy game in the snes cartridge. you couldplay your gameboy game on your TV :D it was great stuff too.
but i think this onewill completly fail... Nintendo is trying to hard to be good.