This is Accelerator Suit Duke, and he's been deemed the "most advanced action figure of all time." Watch him run, watch him shoot, watch him ruin your childhood's conception of everything that is good.
Jack pretty much nailed it after the trailer premiere during the Super Bowl: "it doesn't really feel like G.I. Joe, you know?" Accelerator Suit Duke is about as extreme in that direction as you can imagine, but I must admit, that running-man action is pretty sweet. He's $70.