Board Thread:General Discussion/@comment-3123266-20140303175822/@comment-2090489-20140511031253

Well we saw in the teaser clip the Iron Man helmet turning into Ultron. Thing is, we have already seen the Iron Patriot armer corrupted more than once, and it's latest has been corrupted by AIM. It wouldn't be a huge surprise if something else happened to that armor in AoU to where the suit has a self-sufficient AI system that will upgrade itself and become Ultron. I mean why else would a supporting cast member make it's way into the Avengers sequel? Either my theory is correct, or he is there for the simple reason of being the protector of America and being the first responder to Ultron when he attacks the mainland.