As mentioned above, little is known, but the console will be region free, so we will be able to play the physical games from Japan. (I assume that you will also have access to the Japanese Nintendo shop if you change the region of the console).
Unfortunately, very little is known about the online service at the moment. So far, Nintendo has not said much about downloadable games, except that from autumn onwards, the paid service will also include a free Virtual Console game that you can play for a month.