Updated about an hour ago and just drove 30 miles with it.
Quick thoughts:
1) I love the new more aggressive regen. Before this, even with 40k miles of driving experience I would still find myself needing to brake more when misjudging a big slow down (say from 60 mph to a stop at a red light). The new aggresive regen allows for more flexibility to adjust the pedal and get the desired reduction in speed.
2) Interface, love it. Just like 7.0, it will take some getting used to but so far I really like it. The new media player will get some time to get familiar. It seems quite a bit faster. Maybe its a placebo effect, but it seems that the searching and playing new songs is much more responsive.
3) New voice controls. Didn't know if I would love it, but I do. So much more intuitive. Instead of pressing and holding down the button and mistiming my commands, it just works much better. "Play King Nothing by Metallica" and literally 2 seconds later it's playing.
4) Autopilot. Seems to be much more smooth and in control. Going around curves it seems more confident. It still is not confident however going over sharp hills. Cresting a sharp hill, it will still wander around but doesn't seem to be as drastic. Instead of a "Holy crap what do I do?" like before, its' more or less "hmmm a little unsure, need help here." It also does better with hugging the side of the line that you need to when passing another vehicle.
My only gripe so far is they removed the ability to choose what you right scroll wheel does. I had it set to change the media. I would use it constantly to switch between XM, TuneIn, and Slacker. Now I have no ability to do that from the steering wheel. Scrolling the right wheel only allows you to switch between sunroof, temperature. However, I may have missed something. So if someone on here knows how to change it back, I would appreciate it.
So far, two thumbs up.