When speaking with Kotaku about the Wii U, Reggie Fils-Aime said that, while “there are friend codes”, “it’s not the existing friend code system”, and:
…you will be able to identify people as friends and have a certain level of interaction vs. a different level of interaction for the more general population. The method by which you identify someone as a friend is a lot simpler than what’s happening today with Friend Codes.
Or, in other words, he’s staying relatively tight-lipped for the time being. But I will remain optimistic.