Just tested it in the stream :(
"This Nintendo Network ID has already been linked to another Wii U console."
Originally Posted by Oxirane
Can I Log Into My Nintendo Network Account on a Different Console?
-No, you cannot. A Nintendo Network Account can only be used on the console where it was created. In the future, you will be able to use your Nintendo Network Account with future Nintendo consoles and other devices, such as PC's.
-Currently, the Wii U supports up to 12 individual Nintendo Network ID's per console, which enables each member of the family to have his or her own unique identity on the system.