Nintendo's US press event recently concluded and while all of your Wii information needs have probably been satisfied, nothing else was discussed about Wii-DS connectivity. We know that Iwata already said that the WiiConnect24 service could be used to download content to the DS, whether it be a demo or something else, and also that the DS could also be used as a controller through the Wii's menu interface, but this was not demonstrated at the event or further discussed there.
So what does this mean? Probably nothing. We should still see Nintendo's handheld play a large role in the Wii's interactivity and extra content. We should still see the DS downloading demos from the WiiConnect24 service. We should still see the DS being used as a controller to navigate menus in the Wii's interface. Just because Nintendo didn't show any of the features you'll be able to access on the Wii through the DS doesn't mean they aren't coming. We should be seeing and hearing more on the two consoles interacting as the launch date for the Wii draws near.