The following is transferred during the system transfer process between a Wii and a Wii U:
Wii Software Save Data.
WiiWare and Save Data.
Virtual Console titles and Save Data.
These points will be combined with the points on the target Wii U system, but cannot exceed a combined point total that would exceed 10,000 Wii Points.
Wii Shop Channel Account Activity.
Nintendo Wi-Fi Connection data.
The following is NOT transferred during the system transfer process between a Wii and a Wii U:
Data from Wii settings.
Preinstalled WiiWare software and preinstalled Virtual Console titles.
Software and save data for which transfer is not permitted, such as WiiConnect24 data.
Software that is present on both consoles.
While the software will not overwrite what is already on the target Wii U system, the new save data will overwrite what is on the Wii U.
Nintendo GameCube Game Disc save data.
All data that can be transferred will be transferred at one time. You cannot select what data is transferred.
Any software or save data that exists on an SD Card from the source Wii console cannot be transferred directly.
For save data, transfer it from the SD Card to the source Wii console before performing the transfer.
For software, either transfer it back to the source Wii console before performing the transfer, or redownload it after the transfer using the Wii Shop Channel on the target Wii U console's Wii Menu.
Mii characters are moved to the Mii Channel, accessed from the Wii Menu application on the Wii U console.
WiiConnect24 functionality is not supported on the Wii U. You will not be able to use features that require WiiConnect24 after the transfer.
Depending on the software, some features may be limited after the transfer.