Apple's press release and the CarPlay preview page state that the newly rebranded feature lets drivers access some iPhone functionality through their vehicle's in-car infotainment system.
Specifically, Apple mentions getting directions, making calls, sending and receiving messages and listening to music.
This is all pretty basic stuff, unless you take a closer look at how Apple brought context awareness and tapped artificial intelligence to predict where you may be heading, so you don't even need to enter in an address for a final destination...