Official Xbox Magazine has a hands on preview for us, with minor new details:
-Traffic is dense, just as you'd expect it to be in New York
-Grab a frank from a hot-dog vendor for a health boost. Bump his cart, thought, and he'll get upset and refuse to serve you!
-We saw an ice-cream truck, but it wasn't Mr. Whoopee. It's now called Cherry Popper
-In dense areas like Algonquin, painted yellow lines adjacent to safehouses serve as GTA IV's garages. Park your car there and it'll remain there indefinitely.
-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.
The girlfriends feature is the same as it is in San Andreas, pick up the girl, take her to a restaurant, drive her home, etc. We also got us one scanned page with a new screenshot of Niko and a rocket launcher:
OXM Page 1
Thanks to DC88 For the info! GTAForums Topic