If it's real, I'd expect it just to be a "GotY" version of Smash for Wii U with all the DLC and some of the 3DS stages.

Smash 4 NX makes the most logical sense.It's too soon for a brand "New" Smash brothers, so a "Turbo remix allstar HD & Knuckles" edition makes the most sense. Plus, the Smash Ballot being held last year shows them plenty of characters we'd want to see too, so new characters being introduced makes the most sense.

Now, we debate on people complaining about how they spent so much money on all of the DLC characters just to have a complete addition released next year. But, if my own personal guesses are correct, we'll probably get discounts if we've owned the other two versions. Perhaps even get it free if we owned both versions.

Of course, this is merely my own personal guess work, based on what makes the most sense to me.