Games with additional peripherals will not be available on the eShop. But one exception was the launch title Sing Party. The game was made available on the eShop, but only due to the fact that Nintendo themselves were officially selling extra microphones for the game. But Skylanders and Disney Infinity don't have any other official ways to get their peripherals. Activision and Disney will not be selling extra portal devices. And since there's no way to get them besides buying the game, they will stay retail only. As for Wii Fit U, I'm not sure. Nintendo could always sell additional pedometers, for those who own the original Wii Fit/Plus and plan on buying Wii Fit U digitally.
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