GameTrailers has a developer walkthrough trailer with Just Cause 2 lead game designer, Peter Johansson.

Just Cause 2 looks to be coming along quite nicely and trailer gives you a good feel of the gameplay you can expect from the game. I was big fan of the original Just Cause and I can't wait to get my hands on the sequel. This game should be on everybody's radar this fall when it is released.

One of the many improvements to the game shown in the video is an improved parachute that gives you a lot more mobility than the original. My favorite improvement, which they show you quite a bit in the trailer, is the new and improved grappling hook. The new version now lets you hook onto any surface. It also lets you hook onto an enemy and pull him towards you or hook him to any other object which allows for some inventive ways to deal with enemies. The video also shows off some of the new moves you can use while jumping between and hanging off the side of vehicles.

Just Cause 2 is going to be released for Xbox 360, PlayStation 3, and the PC on September 30th. Check out the great trailer after the break.