A recent article by Yahoo quoted some NPD figures and in the article this was stated:

The last two "Grand Theft Auto" games have provided an immersive story with multiple coinciding missions. The next one is due out in 2004. A month later, "Grand Theft Auto 3" and "Vice City" finish exclusive run on Sony's PlayStation 2 and will be available for Microsoft's Xbox and Nintendo's GameCube. "And they will sell, like, a jillion copies," Pachter said.

The full article can be found at Yahoo.

Update

This is a quote from Nintendo's E3 mini-page, which can be found here.

"With mega-hits like Metroid Prime and The Legend of Zelda: The Wind Waker already exclusively available for Nintendo GameCube, Nintendo is riding a wave of momentum as the show approaches. Industry leaders such as Electronic Arts, Sega, Capcom, Activision, Rock Star Games and many more will be showcasing their upcoming Nintendo GameCube games at the 2003 E3 Expo.."