"Last trailer" our collective large arse. Rockstar isn't done yet. Another GTA IV trailer has been unleashed in the form of an extended pre-order promotion for game retailer, GameStop. In the guise of a travel ad to attract travellers to Liberty City, the trailer highlights all of its best (most violent) features, with a token salesman voice over to sell it to you. We don't need to be told, though - we've been to Liberty City before (massive hands-on coverage here) and will go again when it launches on April 29.