Going live today a new Wii U feature will be implemented that allows you to transfer data between Wii U consoles.
Nintendo have released system update 5.1.0 for Wii U bringing in a new system transfer feature.
Historically a one-time transfer between Wii and Wii U was available. Now with the latest system update you’ll be able to transfer data between Wii Us.
To perform a transfer both Wii Us involved must have the latest update installed. Once down the source Wii U will be formatted. For a FAQ on the System transfer system hit this link.
Update 5.1.0 will also add the ability for users to access the eShop using a Wii Remote, Wii U Pro Controller, or a Classic Controller.
Beyond this, “further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.”