I saw this over on Engadget this morning. It looks like the Nissan Nav system will include the ability to read RSS feeds out loud.
If you look at the picture in the article, you can distinctly see an antenna and a number of bars. Not sure if this would be WiFi or GSM, but definately interesting.

Wouldn't it be great if your car could actually read information to you? We're not just talking about reciting driving directions (that's
so 2001), but rather an audio version of RSS feeds, specifically Yahoo Japan, Sony's So-net "lifestyle blog" and
Nissan's travel guide blog. (C'mon Nissan, no love for
Engadget Japanese?) It appears that this new addition to the
Carwings system, which already provides ho-hum GPS navigation will also pack a 30GB hard drive so you can rock out to Pizzicato Five if you get bored of that mechanical voice. If you attend the Combined Exhibition of Advanced Technologies (October 3 - 7) to be held at the Makuhari Messe in Chiba, you can check out the updated Carwings system -- if you do, be sure to let us know how distracting the synthetic voice is while zooming down the road.