Cate Shortland has now signed up with Marvel to direct 'Black Widow'. Reportedly Scarlett Johansson also signed up for the main character of the movie. She has played Black Widow for the last eight years. Slated for 2020 release, the plot of Black Widow's solo adventure is still shrouded in mystery.
The film also features Samuel L. Jackson, Sebastian Stan, Jeremy Renner, and Cobie Smulders. That cast makes perfect sense, as Nick Fury and Hawkeye have long histories with Widow. It would also give Maria Hill a larger part to play, showing why she is Fury's right-hand agent. The most interesting part though is having Stan in the film. Since this is before Avengers, it would be during his Winter Soldier days, and could show a previous encounter before the two battled in Captain America: Winter Soldier.
Black Widow was introduced in Iron Man 2 and has since made appearances in The Avengers, Captain America: Winter Soldier, Avengers: Age of Ultron, Captain America: Civil War, and Avengers: Infinity War. She was one of the few left standing by film's end and will reprise her role in the upcoming Avengers 4.
Other upcoming Marvel films include Captain Marvel on March 8, 2019, the fourth Avengers movie on May 3, 2019, the sequel to Spider-Man: Homecoming on July 5, 2019, and Guardians of the Galaxy Vol. 3 in 2020.