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The official description for the GameCube Controller Adapter – set to be released on the 5th of December this year in Europe in time with Super Smash Bros. for Wii U – has detailed how the GameCube controllers will interface with the console.
It appears that any game for the Wii U that supports the Classic Controller, the Classic Controller Pro, and/or the Wii U Pro Controller can be played using the GameCube controller.

This wide-spread functionality opens up the appeal for the peripheral to those few who aren't interested in the latest entry in the Super Smash Bros. series. Many people also have a particular fondness for the controller, so the ability to use it on other great games such as Mario Kart 8 will surely be music to many fans' collective ears.
It appears that this compatibility will extend to the Wii side of the console as well, as the description also states that the adapter will work with an original Wii. Here's the official word from the Nintendo UK website for absolute clarification:
This adapter will allow you to connect your GameCube controller to the Nintendo Wii or Wii U. Connect your GameCube controller to your Wii or Wii U console. Compatible with all games supported by the Wii Classic Controller, Wii Classic Controller Pro and Wii U Pro Controller.
What are your thoughts on this highly flexible setup?

CHINKERATOR wrote:I might have to sell my pro controller now
The gamecube is truly the most comfy controller ever.

I just hope the adapter has wavebird support with its huge plug in box.

Did you have one of those massive WaveBird controllers for the GameCube? Is it your favorite way to play Smash? Well, good news friend. Nintendo of Australia has just confirmed that the Wii U GameCube adapter that’s being released alongside Super Smash Bros. is compatible with that controller. It functions just like a normal GameCube adapter, in which you plugin the receiver and sync the controller with it. This is great news for those of you who have perfected your Smash technique using that particular controller.

https://twitter.com/NintendoAUNZ/status/519638758245691393

If you don’t have a WaveBird and you want to pick one up, it looks like there’s a healthy market of used controllers available on eBay. New controllers are running for nearly $200 a piece on Amazon, which is pretty ridiculous for what it is. Still, if you’re loyal to a specific controller and want it brand new, maybe you don’t care about the price.