Never played the first on but it was apparently a GREAT game on ps2. This one's got some much stuff I dont know where to begin. The graphics are now top notch with the most realistic water to date, the game developers have decided to throw out realism and make the physics engine run on LSD, you still have unlimited grappling hook and parachute, and you can grapple people to random object like a person to a flying gas canister and watch them fly up in the air. Here's an extended gameplay trailer.
http://www.youtube.com/watch?v=8BOtdFUDdFI