Other than these bits of news about casting decisions, we don’t really have much information about “Expendables 4” at this point, and Stallone has been keeping the majority of his work under wraps.
This probably makes sense in light of the huge amount of attention that’s focused on the film right now too, as many people are interested in seeing what exactly Stallone is preparing behind the scenes, and they have been curiously probing for new information on a regular basis.
However, it’s critical for Stallone to keep his mouth tightly sealed right now and keep working quietly until he has something big to show the world. Otherwise, he could get in a lot of trouble if people get the wrong impression about the upcoming film.
It wouldn’t be the first time a major production has been spoiled by information about it leaking out to the public, and with a franchise as important as “Expendables”, it’s really crucial for Stallone to do everything in his power to give people the best possible impression of the next film. And in this case, this obviously means being quiet about what he’s doing. Especially if he’s currently juggling various ideas around, which he’s very likely to be doing. It will probably take a while before he gets to a configuration for the plot that truly clicks.