Writer-director Joss Whedon hit the red carpet at the Iron Man 3 premiere in Hollywood last night, where he revealed that his script for The Avengers 2 is complete, and that it contains an appearance by a certain brother and sister duo from the comic books.

"I have actually finished a draft, we're in a very good place. I've got these two characters, two of my favorite characters from the comic book, a brother-sister act. They're in the movie."
RELATED: Avengers Campus Is Officially Open at Disney's California Adventure Theme Park

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 going really well, eventually someone will explain to me that it's not and pull me out of my bubble. I've been writing and meeting with actors and we're starting to storyboard, all the preliminary processes. This is the part where it's all still fun.

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."

"I try not to think of it as topping it. I try to think of this as its own movie. Sometime yeah, I feel pressure and by the way, Shane Black, not helping, Iron Man 3, not helping, because I saw this and man he really got it right. But when you're in the story and you're dealing with these characters that you love, that everybody loves, when you've got the new characters sliding in next to them it's very exciting. Then I don't feel pressure, it's like I'm reading my favorite comic."

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.

"Well there's no update in terms of they haven't said 'Go and make many of these for it shall be on the air.' We've finished the pilot, Agent Coulson is in it, and we will explain why in the pilot. It is wonderful and he is phenomenal in it. We should find out in the very near future whether or not everyone else gets to enjoy it as much as we already have."

CLICK HERE for Joss Whedon's video interview on the red carpet.