This is the DTV Shredder, a militarised skateboard with two caterpillar tracks. It can travel at over 50kph, go up 40-degree slopes, turn around in four feet, and be remotely operated. It's also quite spectacular in action:
Created by Ben Gulak—the guy who made the beautiful-but-kind-of-ridiculous Uno bike—the DTV Shredder was presented as a "first response modular platform for soldiers" at last August's Military Vehicles conference in Detroit.
According to the manufacturer, it can handle any kind of terrain and its low centre of gravity makes it "ideal for reconnaissance, rescue/recovery, mobile surveillance, and medical evacuation operations". I don't know about any of that, but paint it in hot rod red and I'm getting one. [BPG Werks]