In a recent interview with SFX Magazine, Marvel Studios president Kevin Feige discussed Joss Whedon's Avengers: Age of Ultron. In the interview he talks about why they chose Ultron, what they were looking for in a sequel, and the natural introductions of Quicksilver and Scarlet Witch.
When asked why Ultron was chosen as the main villain in the sequel he replied,
“Joss Whedon had a great idea for the character and how to use him to unify the Avengers again and acquire their services once more. He was a favorite. Joss and I were on the production of the first Avengers movie and we started having conversations about Ultron, and how he could come about and how we could adapt his origin to the continuity of the cinematic universe. It literally was just little discussions between takes but thankfully Joss files all that kind of stuff away in his brain. Then when the time arrived, he started outing it, so he went back to that and built a very good story.”
He was then asked if the movie will have anything in common with comic book series of the same name. Basically, they just wanted the subtitle. He explains,
"We didn't want to merely have a '2' after Avengers so we wanted to give it a subtitle. We have various things that we were looking at and Age of Ultron - which just happened to be a the name of a comic book series as well - was our favorite."
Feige also talks about casting James Spader saying,
"I first met James Spader two or three years ago. I thought it would be great to have him in our universe and we finally found the right role with Joss's version of Ultron."
Finally he is asked about Quicksilver and Scarlet Witch, and if he thinks there are going to be too many protagonists in the movie. This was his reply,
"It's always a balance with any movie, not to overwhelm it with too many story elements. Certainly when it comes to comic book movies, you can fall into the trap of having too many villains and in the case of team-based movies, having too many heroes. But what Joss has in mind to bring those characters into the story happens in a very natural fashion over the course of the story. It's also the tradition of the Avengers to switch up the roster every now and again and to have new characters coming in. It's just part of the fun, but we wouldn't have included them if it had just been a case of 'Oh, we want two new figures, two new costumes.' It very much flows with the story that Joss is creating."
The movie is set to be released on May 1st, 2015, and I have no doubt that it's going to be another epically badass Marvel adventure!