Mario Kart 8 was one of my personal highlights of E3, disappointing 2014 release date notwithstanding. Alongside crisp HD visuals, underwater sections, motorbikes and gliding, the newest series entry will also allow you to stick to walls and ceilings. Antigravity mechanics allows Nintendo to defy the laws of phsyics yet further when designing tracks, many of which are based around mobius strips.
This new developer diary with Hideki Konno goes into detail while providing some more gameplay footage. My personal highlight: "You can watch your replay data and bury yourself in regret by watching past losses." I've had enough of that for one day, ta.