Not much meat on that bone though. Lots of stuff but most of it seems like tweaks to existing elements. But, from the looks of it all those little things will add up to make an improved overall experience. Things of note:
- Improved precision on all digital leds -
not sure what this means, hoping it's in reference to Fanatec LEDs (they're problematic in AC)
- GT3 cars use tire model v10. -
that's good 👍
- Added Ballast system through Ballast App (single player only) -
much needed 👍
- Added new F9 vertical layouts -
if this is what I think it is (as seen in the FMOD preview video), very nice
- Added new personal driver texture -
cryptic, but maybe we can choose our race suits now?
- Added Anti-Wrecker protection -
interesting?
- Tyre blister and grain are now tied to the "Wear" settings and not "Damage". -
nice
- Reworked wind curves: now the wind volume is related to the air pressure (i.e. player car will hear turbulence when in draft and AP value goes below 1.00) -
seems like a nice improvement
- When driving, some opponents events are now audible (e.g. skids, surfaces and gear shifts if available) -
nice addition
- New dirt sound effects - 👍
- New brake squeal for some "old" cars - 👍 👍
- added DRL on LaFerrari, Mclaren P1, Nissan 370Z Nismo, Nissan GTR and Ford Mustang -
THANK GOD!! 
All the audio improvements should be nice, there was a lot of room for improvement there IMO. Most of the other stuff I have no clue what it means, but probably all for the better. Sadly, no mention of adding timed races, custom championships, momentarily disabling SC on AI cars, better multiplayer options. But, one would presume we're getting two more updates in the next two months so maybe they're spreading things out a bit. Overall, seems like a good "quality of life" update. 👍
EDIT: From Stefano RE: anti-wrecker protection -
"it's a simple (optional, settable by the server) system that punishes users with a high ratio of collision/km during a race with a sequence of penalities up to server ban. It's designed to fight against obvious wreckers in public servers."
That sounds promising. 👍
EDIT 2: From Aris RE: the 917/30 -
"The Porsche 917/30 is not a competitive race car. It is not a respectable adversary. It is not a mighty opponent.
The Porsche 917/30 is a killer, full stop. And by killer I don’t mean a wolf hunting down some sheep. I don’t even mean a big white sharkchasing a seal or something. No, I mean a T-Rex unleashed upon a group of small mammals trapped in dead end with nowhere to go or escape. It is this kind of terrifying.
While the european motorsport series was strictly regulated in order achieve some kind of balance between competitors, on the other side of the world, the CanAm series placed no restrictions in terms of weight and displacement limits… Mix this rule freedom, with Porsche engineers and with feedback from someone like Mark Donohue famous for his thirst of power and speed, and the result couldn’t be different. While working on the development of the 917/30, the German Porsche engineers took an over 5 litres 12 cylinder turbocharged engine and managed to deliver well over 1100bhp in “safe” turbo boost… it could do more. Donohue comment when he was asked if the power was enough?
“it will never have enough power until I can spin the wheels at the end of the straightaway in high gear.”
And so the 917/30 was developed and unleashed into the unsuspecting CanAm field and devastated it.
The car is not easy to drive as you might suspect. Over 1100bhp at any time, for 800kg on a spyder from the early 70s… it will never going to be easy. On top of that, the configuration of the car doesn’t make things easier either. The enormous 430mm wide rear slicks are locked by a spool rear axle. It means there is no differential. The rear wheels are always locked 100% at all times. This creates quite noticeable coast understeer. You can work out some of it, through the setup, but I’m not so sure you should. You see, the spool rear axle is there to keep both tyres locked under acceleration and this theoretically should give better traction. It would, if you couldn’t spin both wheels at any time, on any gear… but you can blame Donohue for his request to the German Porsche engineers… they sure managed to make him happy, just. There is so much power, so much torque and so much turbo lag, it is very hard to keep traction. On the other hand the car has a short wheelbase and is almost wider than longer, so it’s not that easy to drift around either. So either you do a setup to make the car turn and then feed the accelerator with an egg under your foot… or you go for the opposite. You make a setup with as much traction as possible, become very patient on turn in and mid corner, and then unleash the beast (literally!) at the exit. It might not be the most enjoyable way to drive it, but it works laptime wise. Oh almost forgot. Remember to adjust your driving style as the car becomes lighter from fuel consumption. Before thinking it shouldn’t change that much, let me remind you that it has 400litres fuel tank. Four - hundred - litres.
The Porsche 917/30 won every single race but one, of the CanAm series in 1973; a series were excess was the norm.
So no the 917/30 is not a legendary car. There no finesse in it, no adversary that reminds of it as a nice car to race against.
The 917/30 is a killer. “The Can-Am Killer”.
It's nice that there is another Group C car. Those are always nice and insane to drive. 
(at least for the pc players, not for me yet)
