A couple days ago the teaser shown at SDCC to accompany the revelation of the Avengers sequel being titled Avengers: Age of Ultron was released online (Praise God from whom all blessings flow!). Having watched both versions of the footage (normal and HD) I think there is a dual purpose to the footage besides revealing that Ultron is the main antagonist for the Avengers sequel.
As many of you know soon after Ultron was revealed to be the main antagonist in Avengers: Age of Ultron it was also revealed that Hank Pym is not the creator of Ultron for the film. This has led to much speculation about who exactly is the father of Ultron. However, after viewing the footage for myself it is my personal speculation that not only was it revealed that Hank Pym is not the creator of Ultron, but the creator of Ultron is actually revealed.
As is shown in the footage the Iron Man helmet is repeatedly hit until it transforms into Ultron's head. I believe that this is a major clue revealing that Iron Man is the creator of Ultron. If the creator was anyone else then the footage would somehow be different.
So, if this is true then what does it mean? First of all I am hoping that this may mean that if Joss Whedon kills anyone in Avengers: Age of Ultron it will be Iron Man making the Avengers sequel the familiar creator dying-at-the hands-of-the-creation story similar to what took place in Frankenstein. However, if Iron Man survives then there should be an Iron Man 4 so we can see Stark truly struggle with his decision to create Ultron. Then finally if Tony does not give up being Iron Man as a result of all this then I hope that this will lead to the Civil War arc making its way to film.