During one of the Model 3 reveal test drives the driver stated the car will have a "unique ventilation system...not the traditional vents. There is a single slot". (at 4:55) I wonder why Tesla decided to re-engineer the basic approach to the HVAC ventilation system? Simpler to manufacture, more efficient or some other reason? The lack of dash board vents would seem to rule out separate temperature zones for the driver or passenger which is common on many cars. I often find myself or passengers adjusting the direction of the air flow vents so it will be interesting to see how well it works. Just one more unknown that we'll have to wait for reveal 3 to confirm.