According to IMDb, Rockstar President Dan Houser and GTA/Manhunt veteran James Worrall are the principal writers for Grand Theft Auto IV. Lazlow Jones, who wrote for GTA III & Vice City and did voice work for Liberty City Stories & San Andreas, is listed as a cast member, along with Navid Khonsari who has voiced characters in almost all of Rockstar's titles, including his role as Porn Host in Max Payne 2.
Grand Theft Auto IV will debut October 16, 2007 for PlayStation 3 and Xbox 360. In addition, Rockstar will create downloadable episodic content for the Xbox 360 version.