3. The Vision's Creation
It's hard to say when and where The Vision will be created in Avengers: Age of Ultron, but it is known that Tony Stark and Bruce Banner are the ones responsible (presumably giving J.A.R.V.I.S. a body to help them take down Ultron). It could be that this takes place before or after the Hulkbuster fight, but around this point in the sequel definitely seems likeliest. A recent trailer showed Captain America and Black Widow battling Ultron for a lorry which looked an awful lot like the one in those LEGO sets which had Vision inside, making it even more difficult to say for sure when this all goes down. Regardless, expect to see the artificial intelligence up and running in time to take on Ultron in the sequel's epic final battle.