The Wii U will be available in two models from which the high end one will include more gigabytes and accessories. Users who opt for this model will also be able to access Nintendo Network Premium.
Nintendo Network Premium looks similar to the PSN Plus in ways. Premium members can purchase content off the Nintendo Network on a 10% discount. The savings on your purchase are converted to points which can then be exchanged for unspecified items. We can presume that with enough points you can probably rake in games or DLC.
The service is said to run for only two years, that is from December 8, 2013 to December 2014.
Currently there’s no information as to whether users who opt for the basic version of Wii U will be able to join Nintendo Network Premium or not.