Bluetooth backup camera with indicator lines on the screen and GPS. It can double for the GPS screen. The GPS screen should be big enough to see and located so the driver only need move his eyes to view. Not like the tiny Ford unit in my truck mirror
I'm not a big fan of gadgets like object detection, brake control, lane detection and self parking. I think they lull one into a false sense of safety. These are functions a driver should always have control over.
With the ability and propensity to hack a vehicle's computer, I want as few avenues as possible for someone to see how fast I can go or if my family vehicle can become an ATV.