Qqun a posté sa sur le Forum Xbox...

After receiving much inquiries from readers regarding a possible release of Grand Theft Auto III on GameCube, we contacted a Rockstar representative to get the final word on the situation. The representative cited several reports responsible for the propagation of the rumor and indicated there was absolutely no truth to them. Rockstar currently has Xbox and PC versions of GTA3 on the way, but there are no plans for a GameCube port at this time.
It is sad news indeed..

Sa dit que GTA3 va sortir sur Xbox et Pc mais qu´il ne prévoit pas le sortir sur Gamecube!

Source: IGN