Elon Musk repeated several times over the years that he wants production cars to be better than prototypes, so I agree we'll see improvements in Model 3. I'd guess more or less everywhere, and definitely in the software. If you watch the many Model 3 test drive videos out there in these days, Tesla people make it quite clear the on board software is far from final.

The front seems to be Model 3 most controversial style choice. Personally, the more I look at it, the more I like it. It has a SciFi and traditional look, at the same time, that makes it simple but brilliant.

I'd definitely consider spending more money for a front glass extending uninterrupted all the way to the middle of the roof, as in the Model X. That is clearly a more expensive solution, but I'd love to see it as an optional feature.