Nintendo has announced that the next verion of Mario Kart is set for a spring 2014 release. Mario Kart 8 will be released on the Wii U, bringing new 3D effects and anti-gravity racing to Nintendo's struggling home console. Expect things like underwater racing, air gliging, motorcycles, and more. Nintendo even says that Miiverse will be deeply integrated into the title. Jump past the break for a look at the official trailer out of E3.