From Elon's Twitter Feed:
Q: "Why small trunk lid instead of big hatchback like S&X? I ride a bike not a surfboard
"
A: " Only way to get enough rear passenger headroom was to move the rear roof cross-car support beam. A bike will still fit no problem."
Q: "What is Model 3's aerodynamic coefficient?"
A: "hopefully 0.21"
EM: "Model 3 will be RWD, with dual motor AWD optional. Even RWD will have great traction on ice due to fast torque response of Tesla drivetrain."
Q: "Reveal cars were AWD?"
A: "yes, but production AWD will be a lot faster"
Q: "~5k upgrade like on model s for dual motor? Or less since overall cost is lower?"
A: "Less"
EM: "Wait until you see the real steering controls and system for the 3. It feels like a spaceship."
Q: "Really hoping back seats can fold down on the 3."
A: "They can. Will be great for road trips and camping."
EM: "Edge and contour refinement are ongoing. Even 0.1mm matters."
EM: "Air suspension dynamically adjusts ride height."
EM: "Our production ramp plan should enable large numbers of non X/S customers to receive the credit.... We always try to maximize customer happiness even if that means a revenue shortfall in a quarter. Loyalty begets loyalty."
EM: "There will be an optional tow hitch."
EM: "Matte black was surprisingly popular. Probably makes sense to bring it to production."