Grand theft auto4(or known as GTAIV) Is the next grand theft auto game in the series.The city is the redesighned Liberty City in the year 2007.GTAIV runs on the RAGE Game engine.This game is being written by co-founder Dan Houser.It will include online play.GTAIV has been nominated for:2006 Golden Joystick Award in the One To Watch For 2007 category.
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Development:
On Augest 2,2007 Take-two announced that gta4 will miss its original date of October 16,2007 due to problems coverting on to another system.

WKTT RADIO TEASER:
JULY 13,2007 a Liberty City radio station dubbed "WKTT Talk Radio - We know the truth" was released. The teaser site, located here mentions that you can do your part for the war on terror by calling in and ranting. The number listed, 212-360-2368 can be called allowing the caller to leave a voice mail message of their thoughts on what is wrong with their health, the world, America, or themselves personally. Callers are asked to first read the Terms and Conditions before calling which allow Rockstar to use the voice mail message in the upcoming GTA IV game.http://www.wkttradio.com/

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Gameplay:
Titles in the GTA series have traditionally been heavily mission based (fixed missions must be completed to progress through each game), but the freedom to explore and play outside of the set missions in GTA IV will now be more relevant to progress through the game, according to comments by a Rockstar spokesperson: "We're really trying to blur the line between on-[mission] and off-mission. So storyline, and what you do outside [it], and how those two things influence each other.
An Xbox 360 demo of Grand Theft Auto IV published in the May 2007 issue of Game play reveals that the storyline begins with Bellic standing inside the taxi depot (which Roman operates in the borough of Broker in a converted industrial garage), working at a cluttered desk in a shabby environment. Bellic walks to a brownstone house in Broker, where he pushes open the door and pulls out his pistol—the living room, however, is not occupied. He then moves onto the kitchen, which he also finds to be empty.
He pushes his way through the back door and smashes the window of a red four-door car using his elbow. The broken glass falls onto the street and the seat of the car, as Bellic unlocks it from the inside. He Hot wires the car and sets off to his next destination. The camera angle behind the car is closer to the vehicle than in previous GTA titles, which enables more detail on the car to be seen. After selecting a radio station, Bellic navigates to a section of the BOABO arriving at a dockside. Pigeons can be heard in the sky, and waves can be heard.
Bellic then pulls out his Phone, which has options for phone book, messages, organiser and camera on its LCD screen. He selects phone book, and he is then presented with another set of options: City Contact, Docks Friend, and Cab Contact. After a brief conversation, he informs the receiver to meet him at the docks.

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Promotion:

Trailer 1: "Things Will Be Different"

The first trailer for Grand Theft Auto IV was released on 29 March 2007 at 22:00 UTC. At the time the trailer was released, Rockstar's servers for the trailer's official website became almost immediately overloaded. The trailer is 1:03 in length and features the main protagonist Niko Bellic, who has a brief monologue: "Life is complicated; I killed people, smuggled people, sold people. Perhaps here, things will be different." The trailer features several New York City landmarks, including locations and structures resembling the Coney Island Cyclone, Times Square, the Statue of Liberty, the Empire State Building, the Chrysler Building and the MetLife Building (branded as "GetaLife"). The trailer uses a similar cinematic style to Godfrey Reggio's 1982 documentary film Koyaanisqatsi and used Philip Glass's original music from the film (the opening and closing stanzas of the track "Pruit-Igoe") as well as emulated time-lapsed filming from "The Grid". Rockstar has stated that all the trailer's footage is in high-definition, generated real-time by the game's engine, running on "a next-gen gaming console". Microsoft stated this console was an Xbox 360.

Trailer 2: "Looking For That Special Someone"

On 28 June 2007 at 17:00 UTC, the second trailer was released. The Trailer is 1:06 in length and begins with an aerial shot of Liberty City before showing Niko in conversation who replies "We're all looking for that special someone". The trailer shows Niko holding on to the backs of vehicles and the skid of a helicopter, displays new gun and explosion effects and demonstrates the increased force of the police. Roman is also partially revealed in the second trailer. El Burro and 8-Ball make cameos as their game art is depicted as graffiti on a building opposite the Bank of Liberty, Vice City motorcycle artwork is also apparent on the wall. Other recurring elements from the GTA series appear in the trailer as well; examples include Binco, Sprunk, 24-Seven, Burger Shot and Cluckin' Bell. The song played in the second trailer is "Arm In Arm (Shy Child Remix)" by a New York-based band, The Boggs.

Trailer 3: "Move Up, Ladies"

On December 6, 2007 at 21:00 UTC, the third trailer was released. The trailer is 2:03 in length and begins with Niko arriving in Liberty City, being greeted by Roman, his cousin. Roman insists that they will soon get a mansion, but need to work their way "to the top" first. Niko is seen entering clubs and bars, where he is welcomed by a man who says "Move Up, Ladies". In a later scene, he is asked "So, where are you taking me?" by one woman, and kissed on the cheek by another. Niko begins looking for Roman, who is hiding from gangsters; various combat scenes are shown before Niko and Roman are attacked, captured and interrogated. At the end of the trailer, Niko is threatened by gangsters and is forced to join their gang. The song played in the third trailer is "King Ring," (Король Ринга); by Russian rap artist Seryoga
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Plot:
Niko Bellic is Eastern European and in his mid-thirties. He has come to Liberty City to pursue the "American Dream". Niko was persuaded to move to Liberty City by his cousin Roman, who claimed in multiple e-mails to Niko that he was living a fabulous life, with two women, four hot tubs and fifteen sports cars; but he was in fact telling lies to hide his own failures.
Roman is the only person Niko knows in Liberty City to begin with, and is one of his major connections in the first part of the game. Niko is a tough character, whereas Roman is friendly. Roman is heavily in debt and a lot of people are after him. He desperately needs Niko's support, hence the reason he deceived Niko into travelling to Liberty City. They are constantly bickering. It is later revealed that Niko has also been avoiding other, as yet undisclosed, problems at home.
According to Dan Houser, "virtually none" of the characters from the previous games are returning, as a lot of them are dead anyway.
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Links:
www.grandtheftauto4.com
GTA 4's 2nd trailer

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Developer/Publisher	Rockstar North/Rockstar Games
Media:	Blueray,DVD
Series:	Grand Theft Auto
Platforms:	xbox360,ps3