Several years ago, I was chatting with Robert Sheffield, formerly with Donlen and PHH Fleet Services about future applications for vehicles. Robert was working with a new company, OnStar. The list of ideas was very long, and was oriented towards fleet types of applications; things like updated the fleet management system directly from the vehicle's onboard systems and auto-authorization for fleet fueling services.
An article in Automotive Design and Production discusses the need for broadband wiring in the vehicle to support a growing portfolio of multimedia and other services. The article doesn't discuss the different ways that a vehicle might be networked with the rest of the world. Eventually, we will have smart vehicles that have peer-to-peer communications with the vehicles around them and wireless connectivity to highway information and all kinds of other services.