You can’t keep a good racer down and Nintendo proved it when they finally waved the checkered flag on Mario Kart 3D.
New to the series are the inclusion of situational items like hand-gliders and underwaters propellers that depend upon the terrain. The former was shown as characters leaped off of ramps and into the air, utilizing the item to glide gently across chasms. The latter came into play when the racers entered bodies of water, allowing them to maintain their speed despite being submerged. It is unclear if these will be actual items to be deployed or will simply activate on their own depending on your situation, but they are interesting additions to the franchise nontheless.
Also new is an increased emphasis on customization. Players will be able to customize their karts as they see fit, selecting from a variety of different bodies, wheels, and decals for their karts. A final release date has not been set, but Nintendo reiterated the title will arrive before the year’s end. Expect more information as E3 continues.