As long as there have been science fiction writers, they have been predicting the future. From H.G. Wells and Jules Verne on, what they have written has often come to pass, for a good science fiction writer knows his science. Mostly what they do is describe technology that hasn't been invented - yet.
The lastest to prove prescient is good old Stan Lee, of Marvel Comics. His invention in this case, this guy:
Now DARPA (Defense Advanced Research Projects Agency), the people who brought you DARPANET (later called The Internet, then The Web, now The Cloud), are currently working on an iron man suit for the military.
According to the Army, the Tactical Assault Light Operator Suit, or TALOS is designed to provide ballistic protection to Special Operations Forces.
It will have much of what Tony Stark uses, sans flight and an energy source that kills the user.