At Nintendo's 72nd Annual General Meeting of Stockholders, Iwata confirmed that at the moment Nintendo do not have plans for any paid online services though he could not guarantee that it'll always be free but if one does happen you won't have to pay to access their ordinary services.
The reason being that Nintendo feels that it wants everyone from the regular gamer to the gamer who plays every now and again to be able to switch on the Wii U and play without having to worry about paying for the service.
So it won't be like what Microsoft offer but maybe one day it'll be more in line with what Sony do. Either way some good news that at least we won't be forced to pay just to play online...though most of us knew that this isn't Nintendo's style.
http://www.nintendo....28qa/index.html