Well, I don't know why so many people are panicking and whining without reading between the lines. Only the games whose covers have an ORANGE Nintendo Wi-Fi logos will utilise PTP features.
This implies that a number of games in the future will continue to have free online, while a few (like MMOs) charge you to play online.
My collection of guides on GameFAQs: Read them here
My latest guide on GameFAQs, for Little King's Story! Read it here