I just watched the video demonstration on Joystiq. Basically, you select the new SD card icon on the menu screen, it shows all the games on your card, and when you select one to play it temporarily downloads it to the Wii's internal memory (only takes a few seconds), and then gets deleted from there when you quit the game.
I wonder if this feature allows you to play these games on a friend's Wii from your SD card, since you still need the SD Card to play?









