The DS will be receiving its first CERO Z rating in Japan with GTA: Chinatown Wars.
The Z rating is the highest a title can get, and the only other Nintendo platform title to receive it has been Killer 7 back on the GameCube. In terms of content it's similar to the ERSB's AO, PEGI's 18+ and OFLC's MA 15 ratings.
Capcom, who usually publish the Grand Theft Auto games in Japan, won't be handling the DS edition - instead, Cyberfront will be taking care of business in the land of the rising sun.