N’Gai Croal did an interview with Reggie Fils-Aime and here are parts of it:
“Wii welcomes games rated E, T and M. We haven’t approved AO-rated games. I doubt we ever will. What Rockstar has right now is a game rated outside our spectrum, outside any manufacturer’s spectrum.”
(concerning Wiimote motions adding to the Adult Only rating in the Wii version) “That’s an issue for the ESRB and Rockstar to work through. And as I understand the ESRB guidelines, the Wii controls should not be an issue.”
When talking about WiiWare, he talked of the controls:
"Again, there's no filtering. We have not put any parameters on the control device or how the consumer will play the games. They can be remote-only; remote and nunchuk; classic controller; Gamecube controller. All of that is allowed."