I'm pretty sure I heard a guy in the treehouse explain how VC purchases will work. You can get them for free on Switch if you have the game for both 3DS and Wii U. If you only have one of the versions you will have to buy again.
And no, this is too stupid to be just made up by me.
Wait so if you didn't double dip with 3DS and Wii U, you don't get squat? Really?