http://uk.gamespot.com/news/6152265.html
Iwata gave an interview and mentioned some details about what they intend to do with the Wii's online capabilities. Importantly, there is an implied connection with the DS (you will apparently be able to get demos for the DS).
This gives me a bit of hope that some of the games that you get from the "Virtual Arcade" service can be "transferred" and played in the DS (they would need to develop emulators for the DS though, which is why I'm not that hopeful).
Ivo.