With the growing number of fans of the Marvel cinematic universe and characters such as Hayley Atwell's Agent Carter and Scarlett Johansson's Black Widow, "there's obviously a drumbeat that is banging louder and louder that we want a female lead superhero," says Marvel co-head Louis D'Esposito. But is it finally time to bring one of the many kick-ass leading heroines to the silver screen?

'The Avengers' and 'The Avengers 2' director Joss Whedon spoke of his outrage over the lack of these female-driven films, but D'Esposito, speaking with ComingSoon, says it's not so simple.

It's hard because we have a small group at Marvel. We do two films a year. To get those two films done and to do them right takes a lot of work and manpower. And female-power, obviously. To add a third film and to just put it in the slate right now is difficult. We have these next three, four, five films coming out and that's what we're really concentrating on.

These films he speaks of are the upcoming 'Thor: The Dark World' (November 8), 'Captain America: The Winter Soldier' (April 4, 2014), 'Guardians of the Galaxy' (August 1, 2014), 'The Avengers: Age of Ultron' (May 1, 2015) and 'Ant-Man' (November 1, 2015). Aside from those officially announced releases, Marvel revealed three open premiere slots for still-untitled films -- July 8, 2016, May 6, 2016, and May 5, 2017 -- two of which are (key word here) rumored for 'Doctor Strange' and 'Black Panther.' So the short answer is, probably not for a while

However, it does seem as though Marvel is taking the needs of fans to heart. Aside from their upcoming TV series, ABC's 'Agents of S.H.I.E.L.D.,' which features a few strong female characters, 'Age of Ultron' will introduce another classic character to the universe, Scarlet Witch. Which other female heroes might join these ranks in the future?

"[W]e have strong female characters in our films from Black Widow to Pepper Potts to Peggy Carter and you never know. Maybe there's an offshoot film with one of them. Or Captain Marvel, you know?"