The next Men in Black film will include a female agent in a "prominent" way, producer Laurie MacDonald told BBC's Newsbeat.
"There will be a prominent woman in black in the fourth," she said, not giving any other big information about the movie. "We are quite early on it," she explained.
The third film, the final of "a bit of a trilogy," came out in 2012, ten years after the previous movie in the franchise. It's unclear whether the fourth will be a reboot or continue the story, as MacDonald and her team are unsure whether Will Smith will return in any way.
There have also been rumors that the franchise would cross over with the 21 Jump Street franchise in some way, which the directors of that franchise have admitted was at least talked about.