Your device will automatically connect to the head unit using WiFi without having to manually connect a USB cable. This means when you get in your vehicle, Android Auto will beam the software to your car's head unit display - no wire required.
It's important to keep in mind, though, that the wireless support is now limited to the Google Pixel and Pixel XL, Pixel 2 and Pixel 2 XL, Nexus 5X, and Nexus 6P devices in North America. It won't work with every Android Auto vehicle unit - and Google says the feature has only been enabled in North America so far. Additional device support will be coming in the future.
According to Cody's teardowns, version 3.0 of Auto was almost ready for the Wireless mode, but it's v3.1 that's required (APK Mirror link) to get things properly working. After that, the wireless mode should work.More news: Sebastian Vettel on pole for Chinese Grand Prix
Android Auto itself has developed as a full-fledged Apple CarPlay competitor, with support for a range of apps from Waze to Google Play Music to Spotify and so on.
"For non-Google devices, we are actively working with phone manufacturers on adding software compatibility and hope to share more updates soon", writes Android Auto team member Lawrence.
Expect to discover more about Google's plans for Android Auto at the company's I/O conference.