This idea crossed my mind an hour ago, what if Jarvis is corrupted and become Ultron? and it uses all the remaining pieces of the destroyed Iron Man armors to builds his new body. Because my friend at SDCC said, when he saw the trailer, the Ultron figure looks much like the Iron man Mark II.
Not just that actually, I think the idea is plausible considering Marvel has made much worst changes to the Mandarin, they would much likely do it again.
And since Hank Pym won't shows up until 2015, how are they going to introduce Ultron?