According to UK’s Retro Gamer magazine, GameCube games will be available via Wii U’s Virtual Console.
The Wii U will be backwards compatible with Wii games with no support for GameCube discs but the magazine stated that GameCube games will “be on the Virtual Console store instead.”
Recently, Nintendo of America president Reggie Fils-Aime said “he’d love to see GameCube games on the Wii U Virtual Console but had “nothing to announce right now” teasing us with a wink.
This information by Retro Gamers could be legit or just a guess, so until Nintendo announces it officially, don’t get too hyped up for it. It would certainly be surprising though if Nintendo didn’t release the GameCube catalog on the console.
Source: Nintendo Life