If your windshield is heated, you should see a sometimes-colored heating grid where your windshield wipers typically park themselves. This is common in vehicles that have a Winter Package installed.
If your windshield wipers come on automatically when it starts to rain, you most likely have rain sensors. Rain sensors are commonly installed in Luxury or Sport packages.
Lane Departure Warning System (Higher end vehicles):
Vehicles that are equipped with this system will have a small warning light come on in either mirror while driving when another car is in your blind spot.
If your windshield detects condensation [window fogging], it will change airflow before it becomes obvious to the driver.