The Scarlet Witch and Quicksilver are the only known brother and sister duo from the Avengers comic books. At first Mutant villains under the control of Magneto, they are recruited to join The Avengers under Captain America. The Scarlet Witch, real name Wanda Maximoff, can control the power of probability. Quicksiler, real name Pietro Maximoff, possesses superhuman speed. It has not been confirmed that The Scarlet Witch and Quicksilver are in the movie, and Joss Whedon might simply be toying with the Internet.
The director did go onto explain that he is already meeting with actors, and that The Avengers 2 is in the process of being story boarded.
It's an evolution, and that goes on all through shooting and it never stops. I've done enough shows and movies to be comfortable with that. You do come to a point where we all agree...You lock certain things in. But then there's a certain fluidity when you're working with Robert (Downey Jr.). Robert's going to want to do something new on the day, and you're going to want him to, because it's going to be funny. So you always keep yourself open."
He also spoke about not trying to top his blockbuster Marvel's The Avengers, and joked about how Iron Man 3 director Shane Black is not 'helping' by getting his Marvel Phase Two sequel "right."
When asked about his ABC pilot Marvel's Agents of S.H.I.E.L.D., the filmmaker revealed they will hear whether or not the project is greenlit very soon.
for Joss Whedon's video interview on the red carpet.
Avengers: Age of Ultron comes to theaters May 1st, 2015 and stars Aaron Taylor-Johnson, Scarlett Johansson, Robert Downey Jr., Elizabeth Olsen, Chris Hemsworth, Chris Evans, Cobie Smulders, Jeremy Renner. The film is directed by Joss Whedon.