Stallone has apparently been in contact with aicn to clear up any misleading and fake plotlines about Rambo V circulating around the movie sites. He wants rumour control. So out goes the plot about Rambo heading into Mexico to rescue a kidnapped girl from human traffickers and in comes this...
A top secret wing of the US military have been trying to tap into the darkest, most primal nature of man in order to make the perfect, most cunning, violent and ruthless killer they can in order to create the perfect soldier. They succeed but the creature massacres everyone and escapes from the facility in the arctic and then proceeds to head south to the forest wilderness of the US. Rambo is then enlisted to hunt down the creature and face something that is smarter, stronger, more cunning and more violent than himself. Basically Rambo vs Predator.
It's called Rambo V: The Savage Hunt
Here is a written synopsis. I know this sounds like a step into sci-fi for Rambo but it might be an excellent step.
If you want to hear it from the man himself click on this link to hear it.
Stallone details Rambo VSo, you like the idea or not? I think its killer.