According to Colombia Reports
"Sylvester Stallone, is reported to be arriving in Colombia in the first weeks of November to film scenes for the fourth part of the American action series “The Expendables.”
Arnold Schwarzenegger is reported to be accompanying Stallone on the visit.
The “Rambo” star and Schwarzenegger, known for his character in “The Terminator”, will be the next in line of celebrities who are flocking to Colombia to film upcoming movies, local media reported."
Meanwhile the head of NuBoyana Film Studios in Bulgaria suggested that Expendables 4 would be filmed in that country in 2016:
"SOFIA, Sept. 1 (Xinhua) -- Filming of The Expendables 4 and another movie with Morgan Freeman is in the pipeline for Bulgaria-based NuBoyana Film Studios amid dozens of world blockbusters already made there, an insider told Xinhua.
Yariv Lerner, the CEO of NuBoyana Film Studios, told Xinhua that the movie with Morgan Freeman would happen either at the end of this year or the beginning of next year, while The Expendables 4 would probably be made mid-2016, showing the upward trend in the company's development."
I think by this point most of us would prefer to see the next Expendables movie filmed anywhere other than Bulgaria again so lets hope there's some truth to this Colombia report.
The box office success of Terminator:Genisys overseas is still being reported on with the movie having now become the first American film to earn $400 million worldwide after making less than $100 million domestically. You can read more about it in this article by Forbes.