FHM (a UK magazine) has a new screenshot of Grand Theft Auto IV in their latest issue. The new screenshot shows a car (at night) going over a ramp, and being tracked by two helicopters. Thanks to Torchwood (from the forums) for the info.
The latest issue of PSM also contains new screenshots, which are part of a three-page hands-on exclusive preview. The first screenshot shows Niko in a subway shootout, and the second shot is very similar to this scene from Trailer 3. Thanks to Chargr and Mavros for the info.