HappySqurriel on 13 June 2011
No solid information has been released ...
Nintendo did state in the press conference that part of the justification for the tablet was that the internet was going to be heavily integrated with the Wii U; and they have also said that they were working with third party publishers and developers to produce their online service, and don't want to implement a one size fits all system. I suspect what this means is that Nintendo is implementing an API that contains most of the features you would expect from a modern online gaming service, probably implementing some new/unexpected features, and developers can pick and choose from those features what they want to include in their games.
