The April issue of OXM (Official Xbox Magazine) contains a new preview of Grand Theft Auto IV, along with one new screenshot. The screenshot shows Niko in a black suit, holding a rocket launcher, and standing next to a blown-up car. The only new point mentioned in the preview is that painted yellow lines adjacent to safehouses (in dense areas such as Algonquin) serve as garages. “Park your car there and it’ll remain there indefinitely,” the magazine says. Everything else in the preview has been seen/mentioned before.
Keep an eye on this topic at the forums for all the latest updates. Thanks to DC88 for providing the info.