Online retailer NewEgg currently has Mario Kart 8 up for pre-order and we found something interesting under their description. The interesting thing is is that the website states that gamers will be able to customise their vehicles and build their own tracks in the game. This, by no means, has been confirmed by Nintendo, but if this is true then color us surprised! Check out the quote:
Mario Kart 8 Wii U is a new game for the Wii U. It features new elements such as customizing bikes and designing your own tracks. It is the sequel to the game Mario Kart 7.
Keep those fingers crossed.