The new film being directed by Deadpool helmer Tim Miller, brings Hamilton, Schwarzenegger and Cameron back together for the first time since 1991's Terminator 2: Judgment Day.
"As meaningful as she was to gender and action stars everywhere back then, it's going to make a huge statement to have that seasoned warrior that she's become return," Cameron said about Hamilton joining the project during a private event, Deadline reported.
"There are 50-year-old, 60-year-old guys out there killing bad guys, but there isn't an example of that for women."
Cameron is planning a new Terminator trilogy and has created a writer's room with Miller to plan out the story that includes David Goyer, Charles Eglee, Josh Friedman and Justin Rhodes, noted The Hollywood Reporter.
Recently, Cameron praised Hamilton's performance as Sarah Connor in reference to the issues he had with Wonder Woman.
"I'm not saying I didn't like the movie [Wonder Woman] but, to me, it's a step backwards. Sarah Connor was not a beauty icon. She was strong, she was troubled, she was a terrible mother, and she earned the respect of the audience through pure grit. And to me, [the benefit of characters like Sarah] is so obvious. I mean, half the audience is female!" the filmmaker said.