User blog comment:Jamie/Episode 8 - Wonder Woman/@comment-166-20140528191451/@comment-24901406-20140531221142

Marvel have a "plan". The basic structure of this is that every year they release a certain number of movies, and each movie will fit into a "category".

As of the moment, Marvel produce two films a year, so Kevin Feige has decided to introduce this system, one film will be a "sequel" to an existing movie, the other will be a "new property" that has never been done before. This starts this year and will run until at least 2017 (as you can see 2014 is Cap 2 / GotG, 2015 is Avengers 2 / Ant-Man and supposedly 2016 is Cap 3 / Doctor Strange, 2017 Thor 3 and Black Panther). Marvel are considering adding a third movie, which would cover a "spin-off" category. A Black Widow film seems almost a certainty once this third slot is set up, it is more a matter of "when" rather than "will" (2018 being the earliest possible chance to do this).

Wonder Woman depends on DC (who have finally found the courage to make a movie seemingly) to encourage Warner Bros. to make the movie. Unlike Disney and Marvel, DC are very much under their thumb and so that is a far more complicated matter.