UK magazine, Retro Gamer, is claiming GameCube titles will be playable on Wii U. In their statement they do reiterate GameCube discs are not compatible with the new system, as it is only backwards compatible with Wii discs. The magazine is claiming GameCube titles will in fact be available for purchase through the Wii U’s eShop. Details on this have yet to be confirmed by Nintendo.
“Backwards compatibility with Wii will be included but you’ll no longer be able to play GameCube titles. They’ll be on the Virtual Console store instead.”