It's not exactly Iron Man, but Lockheed Martin's Human Universal Load Carrier may be the first step down that road, allowing soldiers to cybernetically increase their strength for days at a time, as well as shield its wearer from harm.
Lockheed are so excited about the Tony Stark-inspired suit that they've made a promotional video extolling its virtues over a Garageband-friendly soundtrack:
The HULC (So close with all these Marvel references!) is also being fitted with a new battery that won't just allow the suit to last three days on one charge, but also power other equipment as well. We're interested, but won't be buying one until they've worked out how to make repulsor rays a reality.
Lockheed's HULC Super-Soldier Exoskeleton Gets More Juice [Popular Science]