Avengers: Age of Ultron will introduce the character The Vision, and now we know more details on his filmic origin story. Beware of spoilers.
Entertainment Weekly (via Slashfilm) explains how the origin is tied to that of Ultron, the chief antagonist. While Ultron was created by Hank Pym in the comics, the movie will instead see Tony Stark making him to lead an army when the Avengers are busy. Ultron then goes rogue and makes The Vision in order to prove to Stark that he can also create life.
Thought not officially announced, Paul Bettany has been cast as The Vision, after having played Stark’s smart-home artificial intelligence, J.A.R.V.I.S. Director Joss Whedon confirmed a connection between The Vision and J.A.R.V.I.S. by saying “it’s not a coincidence” that Bettany plays both, but declined to give more details.