This is definitely going to become a very hot topic within the JC2 community and even the modding community.
It's pretty standard for most sandbox games for someone to try mod it or create trainers, and that was something that the original Just Cause lacked. But what's extremely unusual, is for someone to create a mod for a game demo... and for the first time ever, someone has actually created an awesome mod for the Just Cause 2 demo!
As stated in the previous post, this mod created by Gibbed, unlocks quite a few hidden vehicles that were included in the Just Cause 2 demo's archives. Not only that, but you can call in ANY of these vehicles and even all the weapons from the black market for free!
This kind of mod would normally only be done for a full game, but creating one for a demo is by far the most awesome thing!