The latest issue of German magazine Computerbild-Spiele contains a new five-page preview of GTA 4, eleven new gameplay screenshots, and one new piece of artwork.
* Pedestrian reactions are more true-to-life than in previous games.
* The WASTED! system is still intact. If you die, you end up at the nearest hospital (minus your weapons) the next morning.
* One button press will get you into a car. A second button press is required to start up the car's engine.
* Niko wears a helmet while riding motorcycles.
* Surroundings are more interactive (bullet holes from gunfire, environment reacting to explosions, etc).
* You can find "useful things" in cars that you hijack.
* The game is set in 2008.
The German magazine is still in the process of being translated, so keep checking for any updates i will add.