As correctly remembered by hwrose379 in the comments, this box art was initially visible as a very small image in the original announcement (linked in the text below). It seems even more feasible, as a result, that this provisional design will be the final box art.

Original Article:

Mario Kart 8 is a vitally important, big-name release for the Wii U, as Nintendo will hope to see it prompt the levels of enthusiasm enjoyed by Mario Kart Wii and Mario Kart 7 on the Wii and 3DS. It's not that far away, either, with a worldwide May release confirmed.

With its arrival in a few months, it seems that some retailers are having a stab at box designs, and it's unclear whether they're being mocked up and since repeated around the web, or whether Nintendo's provided a provisional design for them to use. We're naturally cautious of retailers of which we've never heard, but will happily file this as a sensible provisional design now that Amazon France has joined in. The various European arms of Amazon are often in early with box designs and even, occasionally, product reveals.

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If this provisional design does make the final cut, let us know whether you think it'll look good alongside the rest of your Wii U game boxes. It seems quite spiffy to us.

Mario Kart 8 Boxart

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[source amazon.fr]