The Iron Avengers were featured previously in the Marvel Comics limited series "Earth X", originally published from 1999 to 2000. It is also set on Earth in a future dystopia. As part of this storyline, most of the Avengers are dead and Tony Stark has created robot versions of them.
James Rogers, is said to be the son of Captain America and Black Widow. Except for the fact that Black Widow upon completion of her spy training, was made sterile, to make a more vicious and unforgiving assassin.
Ultron was not the directors first choice for main villain.