According to Nintendo of Japans website, the new Zelda DS will support the Nintendo WiFi Connection by allowing you to play a mini-quest in the style of the four swords adventures. Very little has been released about this new feature, but what we do know is that you can not play any strangers; only people you have added to your friend code list.
Also on the Japanese website, on the page about Zelda DS, there was a picture of a Nintendo DS with WiFi signals going to the Nintendo Revolution. Could this suggest a possible DS to Revolution Link up with the Zelda Game.