Arnold Schwarzenegger said he wouldn’t be in The Expendables 4 without Sylvester Stallone, so 2017 ended with little hope of The Expendables 4 happening.
Then in early 2018, Sly renewed hope, and in May of that year it looked like The Expendables 4 was officially back on.
In March 2019, Sylvester Stallone got fans pumped for the movie with a throwback photo alongside Arnold Schwarzenegger and Bruce Willis.
In July 2019, Sly posted that he was starting to cook up the next Expendables adventure, after a flash of inspiration came on July 4th.