I have to say I didn't like the X in the corner, it was too small. I have trouble touching buttons in the car when it's moving. The finger is on the end of a long arm and any motion of the car is not coupled to the finger, so lots of relative motion.
I'm also not a fan of the swiping everything to close it, especially when it has three valid positions and it only closes from the last of the three, yeah, I'm talking about the radio/entertainment whatever they call it. I'll deal with the X in the corner.
I just drove 460 miles today, so I'm wound up about the issues.
I may have finally come to grips with the new icons. My core set is on the display now. They are each different colors, so I don't need to see any detail. But the V11UI is much more distracting, in the sense of requiring much more interaction to get anything done. This is most apparent in the A/C-Heating controls. I am always having to muck with them to get comfortable. That's a lot more time my eyes are off the road.