In Nintendos Fall conference in Japan last week, Iawata explaned how their SD card solution for the Wii storage will work:
We will make it so that, when there is not enough room on the Wii’s internal memory, you will be able to purchase and download Virtual Console and WiiWare software directly from the Shopping Channel to an SD memory card. We will also make it so that you will need to go through just one process in order to transfer Virtual Console or WiiWare software stored on an SD card to the Wii console and then be able to play it. We would like to deal with this issue utilizing two methods. Since the updates to realize these new structures will require significant revisions to the Wii system, and these changes need to be made by taking care of a variety of different angles, this method will become effective beginning next spring. For some of you, this may be considered late. But please know that we really appreciate your cooperation and understanding. We are working hard so we can begin the service as soon as possible.
It looks like they game stored on the SD-card have to be copied to the Wii’s internal memory. I hope they make the copy process fast, because how it works now, it takes ages to copy to or from the SD card.