User blog comment:Gcheung28/Fannotate the Latest Avengers: Age of Ultron Trailer/@comment-1317092-20141026030155

At 01:07, Ultron is alongside the twins. If they become allies for a small part of the film, then Ultron would be replacing Magneto as the villain who lures them into an evil team, and Pietro and Wanda would be replacing the Masters of Evil in Ultron's history (since Ultron's first appearance was as the new leader of the Masters of Evil). Somewhat fitting, considering that in the comics, Ultron is Wanda's father-in-law ;)