Continued....
-Action- Duck-and-cover combat, beefed up hand-to-hand, physics engine for more realistic pedestrian flattening and movement, including jumping, hanging on ledges (and surfing subway trains) ect.
-Buildings- More interiors, more height, more secret places to find.
-Mini-Games- Take your friends out for some drink driving, golf, billiards and possibly even skateboarding(there's a skate park by the water, but rockstar would say nothing).
-Visuals- Leaves flutter in the wind: sun, rain and wind sweep through Liberty City; yup, this game looks awesome.
-Grab a frank from a hot-dog vendor for a health boost. Bump his cart, though, and he'll get upset and refuse to serve you!
-Set way points on the main map at any time and you'll get a GPS route on your mini map that shows you the right path to take. In more expensive cars, the GPS will give you audible voice directions.
-Stop and pay at the toll booths! You'll draw the law's attention if you don't.
-Expect some platforming elements. One mission we played had Niko shimmying along a roof's edge as he climbed his way to top.
-You can phone Little Jacob during missions and have him bring you weapons in the trunk of his car.
-Clicking on ATMs lets you check your money supply.