I would label this one as a rumor for now, but Famitsu magazine is reporting that The Legend of Zelda: Phantom Hourglass for the DS will have online voice chat. Here’s the skinny:

UPDATE: The original translation from ZU was wrong, hence the rumor posting.  Here’s the actual translation:

“The beginning of an adventure with a new feeling that challenges you to use the stylus!

The newest game of the Legend of Zelda series fully exploits the functions of the Nintendo DS! Let us introduce this game’s greatest feature: the stylus system! In the newest installment of the series, you can draw with the stylus the path the boomerang will follow or the route of your ship. It also uses the Nintendo Wi-Fi connection for a versus mode.

Take it for what you will, but that would be very cool for the game’s multiplayer feature.

Source: Zelda Universe