Joss Whedon on 'Avengers 2' Script, New Characters and 'S.H.I.E.L.D.' Guest Stars (Video)

"I'm feeling really good about it," the filmmaker tells THR of the highly anticipated sequel's current draft.

With Iron Man 3 due out May 3 and sequels to both Captain American and Thor on the horizon, Marvel fanboys have much to look forward to not only in the coming months -- but in the coming years.

And with Joss Whedon's S.H.I.E.L.D. pilot in the can, awaiting a full season order at ABC, the filmmaker is hard at work on the next iteration of The Avengers.

"I've done a draft of the script," Whedon tells The Hollywood Reporter. "To say I finished it would be overselling, but I've done a draft.  I'm feeling really good about it."

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In the current version of the story, Whedon teases the introduction of a brother-sister duo from "back in the day" and, of course, new villains, on which he is keeping mum.

"I had to spend a lot of time introducing all of those characters [in Avengers]," he says. "Now they've met, so I can just start hurting them, playing with them and having fun."

Whedon was on hand to speak with reporters at the Iron Man 3 red carpet premiere on Wednesday. Joining Robert Downey Jr., Gwyneth Paltrow, Don Cheadle and their co-stars on the red carpet was Marvel mastermind Stan Lee, as well as Avengers stars Chris Hemsworth and Cobie Smulders.

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While Smulders, who plays a S.H.I.E.L.D. agent in Avengers, does not currently star in Whedon's pilot, she told THR earlier this year that she has had conversations with the director about appearing on future episodes of his show. Asked if viewers can expect more familiar faces on the small screen if and when the series is picked up, Whedon says his focus is on the agents.

"That's a possibility," he says, "but job one is to always make the show work by itself. Make it work for people who have no idea who The Avengers are, and certainly don't make it tuning in every week to see if somebody famous shows up.

"The show is about the people who don't have super powers in a super power world, and it would be disingenuous to make the whole thing about whether or not you're gonna see a superhero," he adds.

Email: Sophie.Schillaci@THR.com; Twitter: @SophieSchillaci