The electronics actually "change down" a gear or two or three when going downhill to maintain speed. Its always an interesting feeling!!. Going up a hill you see the tacho rise, go over the top and it drops and then it rises again to hold the car on the downhills. If it continues to increase then it drops another gear.
You can have quite fun playing with it all.
The actual gas pedal is only electronic and there is no connection to the engine. Same for stability control. Go round a bumpy corner and if a wheel loses traction then the car starts doing stuff to the individual brakes on each wheel.
Only reason you know it has happened is the hazard warning lights flash.
So I get in the car, Bluetooth connects and music on my phone starts playing. The navigation on the phone then tells me how to get to the next appointment I set in outlook at my desk.
Dial up the speed and a couple of hours later I turn up at the appointment within a couple or minus minutes.
Talk about lazy :)
Unfortunately my wife's new Nokia 920 will not connect to the cars Bluetooth and she is not happy about that. Apparently a common problem with WP8 and many car s built in Bluetooth. She is not happy about that but it means I get the new car more often.