It sounds like Sylvester Stallone is entertaining the idea of making a fourth Expendables movie even though Part 3 was supposed to be the last one. The Expendables 3 completely bombed at the box office, and fans were not happy about it having a PG-13 rating. While promoting the upcoming Blu-ray release, Stallone told Crave Online that any future Expendables will be R-rated, and admitted that they made a mistake giving the third one a PG-13 rating.
"Absolutely unequivocally yes. I believe it was a horrible miscalculation on everyone’s part in trying to reach a wider audience, but in doing such, diminish the violence that the audience expects. I’m quite certain it won’t happen again."
The Expendables 4 hasn't gone into development or anything yet, but Stallone has some ideas rolling around in his head.
"I have actually entertained the idea of putting the group into such an unnatural environment that it, in an of itself, creates extra suspense and tension: the 'fish out of water' scenario. That environment might not be time travel, but nearly just as jarring."
I want to see the Expendables team go into space! Imagine Interstellar, but with the whole Expendables team going on some kind of crazy intergalactic mission. That's a perfect "fish out of water" scenario. We can even take it to a more absurd level by having them fight Jason from Jason X while trying to accomplish their mission.
My two favorite characters in the last movie were Mel Gibson and Antonio Banderas, who offered some fantastic comic relief. When talking about Banderas' character, Stallone said,
“His true personality is naturally dynamic so all I did was say 'be yourself and pretend you’re a mercenary,' and the rest including the dialog was all his.”
I like the Expendables franchise, so as long as they make these movies I'll still watch them. I just love seeing all these big action stars team up with each other to kick some ass! Who knows if it will happen, though, since the last movie didn't do too well at the box office.