Sly Stallone recently revealed that Expendables 4 was coming back and Deadline updated that it would get a production delay to next year as Rambo 5 would begin filming in the fall.
We figured major scheduling issues with the main cast would cause delays as Arnold Schwarzenegger is busy with Terminator/Kung Fury 2 and Jason Statham has Hobbs and Shaw.
Omega Underground has learned that filming will stay in Bulgaria, but shooting won’t begin until April.
Only time will tell who will be returning and what new additions will join.
SOURCE: OMEGA UNDERGROUND