So I tried out the latest update and here are some key takeaways:
The first thing I did was to do the Circuit Experience for Lake Louise. Have to say that it's a very challenging track, and for the most part, I was trying my best not to take the corners too wide and to make sure I have enough speed, as it would mean overdoing it or slowing down significantly if I were to back out. I would say that Lake Louise is kind of like the Gran Turismo equivalent of Sebenco Climb from WipEout - both being tough, challenging tracks set around a snowy backdrop.
As for the cars, I'm surprised that the Dodge Demon is actually the fastest car from the update, and can do a surprising 6:37.261 around the Nurburgring Nordschleife (stock, with Racing: Soft tires), which makes the Dodge Demon not just a formidable muscle car, but a supercar killer just as much as it is a supercar itself.
The Porsche 992 GT3 RS could come in at a close second with 6:39.669 (it could be a little better, if it weren't for its low top speed), and the Lexus LFA coming in at 6:46.372. Have yet to try out everything else, but this is a solid selection of cars introduced.
As for the Master License Tests, I was expecting most of them to be significantly harder than the regular ones, and while the difficulty has been ramped up a bit, it will eventually take a few attempts before you're able to get gold. They were easier than I thought, but they still provide much of a challenge, and there is little margin for error.