Was hoping for a standalone Black Widow film. Scarlett Johanson can carry a film by herself, so not sure why she's being overlooked.
At least Marvel gave a reasonable explanation for that.
“Black Widow couldn’t be more important as an Avenger, but like Hulk the Avengers films will be the films where they play a primary role,” said Feige. “Her part in Avengers: Age Of Ultron is very, very big and further develops her character. The plans we have for her through the rest of the Avengers saga are very big and she is a linchpin, in fact, to those films. So instead of taking her out there or doing a prequel which we haven’t done yet, we’re continuing the forward momentum of the continuity of the Cinematic Universe, of which Widow is a key part.”