The last time Gamespot got a look at Grand Theft Auto IV, Rockstar showed them a rather modest taste of what to expect from its highly awaited crime epic, one that gave us only a basic idea of the kind of urban playground the developer was creating. More recently, Rockstar took all that theoretical stuff we've been hearing about with regard to the game's new mechanics, and put it into impressive action with a new demonstration of the Xbox 360 version that started answering our questions about how the designers will change the gameplay in the fourth iteration of their seminal open-world action series. Can they tinker with the formula that sold 900 billion games across the cosmos without damaging its core appeal? Our answer right now? Yeah, they probably can.