Hayley Atwell, who played Peggy Carter in the Marvel Phase One adventure Captain America: The First Avenger, teased that Marvel may be debuting a short film featuring Peggy Carter at Comic-Con 2013.

"There's been an online campaign for Peggy to be featured. People really liked her. So Marvel have made sure that as part of Comic-Con there will be a little kind of snapshot as to what Peggy's actually really capable of, which was finished here and which was great fun. Hopefully, it will lead to other things."
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There is speculation that this "snapshot" could be a short film that bridges Captain America: The First Avenger and the upcoming sequel Captain America: The Winter Soldier. If that is the case, this may be the latest in the Marvel One-Shot series of short films. The most recent short, Item 47, debuted on the Marvel's The Avengers Blu-ray and DVD release.

The actress also confirmed a report from February that she is returning for Captain America: The Winter Soldier.

"They're so tight, the Marvel family, and private. I can say that I am involved in some way in the second one. Just know that it's not me being cryptic, it's Marvel. They can just as easily kill me off if I threaten to tell the story before it's time. They're keeping it all under wraps."

She also spoke about the possibility of revisiting Peggy Carter in a movie or TV spin-off.

"I'd revisit Peggy again. She's pretty uptight. I'd like to, if I get a spin-off, definitely add a bit of humor in there. She's very British. Very uptight. Let's hope if she gets a spin-off it's modern day, so she can relax a little bit, let go of the uniform."