Re: The Avengers 2! The Official News and Speculation Thread - Upgrade section 5
As far as Tony is concerned, this is how I see things going down:
Tony is going modify and inject himself with Extremis, in order to create and armor that Ultron, and/or JARVIS/Vision, can't hack; an armor that is a part of him.
All of this possibly after he attempts to take him on with a normal functioning armor.