Manhunt - Rockstar's Secret Weapon?

Thanks to Shacknews for pointing to a Gamers.com report with the first solid details about Rockstar North's PS2 'survival horror' title, Manhunt. This allegedly disturbing and voyeuristic, long in development game is from the developers of Grand Theft Auto, and has been kept about as secret as it's possible to. But according to this new information in a UK magazine, it's "a wholly realistic survival horror game, in which the player assumes the role of an inmate on death row whose lethal injection is faked, and suddenly finds himself in the middle of a violent urban warfare game arranged for the amusement of its wealthy creator. Your goal is to escape the city... populated by roving armed gangs." Are Rockstar keeping this quiet to get the game onto shelves unbanned, or is the stealth marketing just a publicity ploy?