Keep forgetting to mention a couple things I learned:
1) Because the inverter and motor are liquid-cooled, they can sustain long-term high-current abuse without getting near thermal limits. That means sporty mountain climbs with a fully-loaded car in extreme heat without power being cut back.
2) Two coolant loops (inverter + motor, battery) which can be joined so heat from inverter/motor can be used to heat battery and the like.
I also mentioned that it would be great to be able to pre-heat the battery when it's not connected to A/C because the loss of regen when it's really cold is irritating. They're clearly planning on letting you pre-heat the cabin (the iPhone app lets you control HVAC and you can see interior & exterior temps). He said the platform is built in such a way that this would be possible and he'd pass the idea along (this is someone who's been with Tesla since it was 30 employees -- obviously a senior guy with some clout -- so I didn't feel like my comments were going into the ether)
Related to loss of regen, he actually mentioned how ABS can kick in during regen and you feel like you're launching forward instead of slowing down. So they're aware of that issue for sure. No word on what's being done about it (outside of what he's been working on recently).
I did speak to an employee responsible for noise/vibration. She and I briefly spoke about how a car without a motor needs everything else that normally might make some noise to be silent.
Talked to a couple folks about the touch screen design and capabilities... I dug a little into the back-end of it ... so e.g. the radio UI is clearly Tesla, but it's a standard radio module it's controlling. APIs will be exposed to control components like those so e.g. developers can make better-than-Tesla apps for this stuff. He was nodding in full agreement. The entire platform is connected to cellular data and available to be manipulated via the iPhone app. In fact, the iPhone app was showing us a live map of where the two betas were. The touch screen system has google maps which can behave just like it would on your cellphone. It'll also have on-board maps for full GPS capabilities.
The systems are going through a LOT more testing than anything in the Roadster did. Extreme heat and cold (and what that does to all aspects of the car -- HVAC, LCD screens, drivetrain, door and handle operations, etc), water ingress, bumps, etc.
Crash-testing is going VERY well apparently. He couldn't answer exactly how well or when the five-star data would be released (not allowed to divulge) but we spoke about the CAD-to-real-world translation and he said that was working very well and very much to their advantage.
Excellent to meet folks from all the different engineering aspects. No other opportunity like this to be able to talk to the folks actually working on the car. I'll keep posting stuff as I remember it. My brain hurts from the amount of data I consumed!