Here is an important factoid for you to know in the sad but possible situation that your brand new Wii U clonks out on you shortly after you get your hands on it. If your Wii U dies, many gamers wanted to know if there was a way to retain your Wii U Network ID and we are happy to report that there is. With that said, there are some limitations, there is no currently a mechanism for users to transfer their Network ID themselves but as we said all is not lost. If you want to retain your Network ID as the process stands today, you’ll have to send your console to Nintendo.
“Nintendo of America’s repair process includes the transferring of the Nintendo Network ID to a new Wii U console if a replacement system is needed.”
With that said, this means that if your Wii U does in fact die on you, do NOT return your defective unit to the retailer, not unless you don’t want your Network ID. Instead, you should send the unit back to Nintendo because they require physical access to the hardware that your ID was registered on in order to recover your account.
In another item of note, remember that you can’t yet sign into another physical console with your Wii U Network ID in the same way you can do with PS3 and Xbox 360, though Nintendo promises the capability at some point in the future.