Something I'd like to NOT see would be something way too futuristic or totally ridiculous. This is about the time in the COD franchise they started getting loopy with it because they ran out of semi-realistic things to do (and I know, Just Cause is not really realistic, but relative to jetpacks and wall walking etc it is)... so I really hope they figure out some more creative things in the game that don't try to make it too sci fi or futuristic.

What I would like to see though, is some more semi-RPG elements. Not too heavy on the RPG stuff, but just a little bit, and I'd like to see them do things that make the world have more slower paced immersion mixed in (at your own will) with the fast paced over the top action. If they could keep the map the on the massive scale that they do but find a way to bring out more detail and uniqueness to each little area so that the world feels small and big at the same time, I'd love that.

I'd love to see a snow location with lots of little mountain towns (and some green forests all around the edges) and you have some skis or a snowboard that you can pop out similar to the parachute, and make it like a skiing/snowboarding snowy mountain type of thing

Lastly, you know how JC2 has the setup where the gangs all take control of their own territories after you overthrow the govt? Make it so after that story is completed, a new system is introduced called gang warfare, where you can go into options and click "Choose Colors" select whichever gang you want to fight for (and you can change that at will when you want) and then you have to conquer territory and the gangs fight eachother at the borders of their territory automatically on sight. It would make the game last forever and give it shit loads of replayability.