Black Widow's director Cate Shortland seems to be alluding that the movie will be the swan song for ScarJo as Black Widow and will just be the start of Florence Pugh's Yelena.
“[Kevin Feige] realised that the audience would expect an origin story so, of course, we went in the opposite direction,” Shortland tells Empire. “And we didn’t know how great Florence Pugh would be. We knew she would be great, but we didn’t know how great. Scarlett is so gracious, like, ‘Oh, I’m handing her the baton.’ So it’s going to propel another female storyline.”
Addressing the MCU fans/ beef with Endgame regarding a lack of funeral for Natasha, Shortland said.
“In Endgame, the fans were upset that Natasha did not have a funeral. Whereas Scarlett, when I spoke to her about it, said Natasha wouldn’t have wanted a funeral,” explains Shortland. “She’s too private, and anyway, people don’t really know who she is. So what we did in this film was allow the ending to be the grief the individuals felt, rather than a big public outpouring. I think that’s a fitting ending for her.”
Marvel's Black Widow comes out in November maybe