Straight from Nico Nico Chokaigi 3.
☆ NintendObs Weekly – Monday, April 28, 2014 – Sunday, May 4, 2014.
Choosing your characters
Customizing your karts
Customizing your settings
Choosing your races
Loading screen
Source: imgur, Nintendo News.
And from Nico Nico Chokaigi 3, courtesy of sawaramkds on Youtube:
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…
…Wanna play? Buy a Wii U.
And if you’ve already got yours, click on Mario Kart 8 for everything you need to know about the game. 😀