At a Marvel panel at the Fan Expo Canada, a fan asked M. Lee, when we could expect a Black Widow solo film. His answer confirmed something entirely different:
We haven't made a Black Widow movie but she's been in some of our movies, and she will be featured more prominently as we move forward. And the chances are she will have her own movie because eventually all the superheroes are going to have their own movies. They are already working on Ant-Man, Dr. Strange and the Black Panther and there are others I am not allowed to talk about.
We already know that Ant-Man is currently filming, and Doctor Strange is still working on finding its cast, but Black Panther is entirely new. Kevin Fiege told us to expect it in the future, but this quote from Stan Lee suggests we'll see it soon. What do you think?