Main features remain the same. Google Maps uses GPS to get the basic idea of where you are and then rely on the camera to get a more accurate location with 3D arrows pointing to places you need to rotate. It should be noted that Google does not want to rely too much on AR. Hold the phone in AR mode for a long time and not only will downgrade your device, but eventually the screen will darken to make it change. This is also the case with security (Google would not want people to hit each other), as well as saving battery power and data.
AR technology will actually take over conventional navigation, at least not without glass-style clothing. However, this should help in situations where you are facing a difficult intersection or otherwise do not have precise bearings. It could also come to your rescue moments when GPS is lower than accuracy, especially in big cities, where tall buildings can sense satellite signals.