The subject line contains a question mark because I've seen different, conflicting reports online. Some articles say the story for Expendables 4 would have been too expensive as a movie, so Stallone agreed to write it as a comic book instead. Other articles say the story for the comic is not at all what is being considered for the 4th move, but is something completely different.
Either way....for Expendable fans, Stallone has co-written a new comic book called "Expendables Go To Hell". It's being launched as a crowd funded book on Indiegogo.