All this does it make the wait even harder. Looks great.
Some refinements to the shooting, which is pretty cool, though showing the arm hand and gun looks a bit odd, especially when the gun is firing, fine tuning your shots looks good though.
The physics look improved, the animation when you run someone over isn't on the same level as Euphoria but it looks like they tweaked it to make the people you run over move less like ragdolls, more like they have weight and limits on their limb movement when they're hit/dead.
The framerate looks good, hard to tell with how these clips were filmed but it looked much better than the original.
The lighting looks quite good too, the graphics are more cartoony than GTA4 but the lighting makes up for a lot of it. The framerate should be a lot higher than GTA4.