I'm surprised at the majority of negative outlook here. People complained about six wide, but they got used to it, so then they started to complain about how goofy some of the cars looked with the four wide windscreen and a six wide body and the proportions. Perhaps some people just need something to complain about. My Lego city is called Supercar City because most of the cars are Speed Champions. I have some mocks that are six, some that are eight. Personally, I think five and seven wide builds would be better, but with the current part set this gets to be a little tough. I love the extra detail versus the generic city stuff so I certainly don't mind some 8 wide instances.
For me I do a lot of car builds and I think this move is wise to better capture the details of these cars. For example ever try to mock and old Lemans racer like they did with the 917? The proportions are all wrong on that SC set because you can't get a four wide windscreen low enough due to the fact that the way they do the fenders you are left with only two studs in between on a six wide build, so you either have to push the windscreen back or go an extra stud wider on each side. The 917 is a wide car and the windscreen sits low between the fenders, same with all of the prototype cars. These demand eight wide builds to really capture the look. Having to have huge straight angled fender pieces covering half of it. Kind of ruins the look. The new curved fenders help a little as the inner portion is a little lower, but it should be a plate or two even lower to allow for better front end detail. I personally, wish they'd do a plate based fender like the newer squared off ones, or even better, have a plate that sits lower down then a thin plastic "panel" like part that comes up and then goes out to handle the curve of the fender over the wheel. Another great addition would be a nice curved brick inverted and from the top like the 45 degree slopes in 1x2 and 1x3 format so you can create custom fenders that are inline with the side bricks or plates, versus encroaching on the interior. This would allow for nice six wide builds without this issue allowing things to be more accurate.
I think this set looks great and I'm inspired to pick it up when it releases. Also excited about the six wide windscreen for some cool SUV builds. The city ones short of the 2x3x6 one are just to upright for my taste. I look forward to the next few release of this lineup.