Ultron? Honestly, I'm excited for the movie, but not the villain. Ultron is easily my least favorite recurring avengers villain (with Kang being a close second). He's not that interesting, but when he was it was always because of his connection to Pym. I hope Stark isn't his creator in this. I really enjoy RDJ's Iron man/Tony stark, but he really doesn't need to be in the center of everything in the movie Marvel U. but, with no Pym and Stark's obvious ability to make aI's (atleast I'm assuming thats what you'd call Jarvis) he seems the most likely candidate as Ultron's creator.