I've heard the devs speak of dynamic brake physics (fade/overheating) in the 'town hall' meeting they held many months back. Yes. They actually held a live chat and let people ask questions. Pretty neat.
My understanding from talking with one of the top iRacing drivers the other night is they need a better aero model and tire physics model....and what sim doesn't need better tire model right? lol. The cars with street tires don't seem to be as effected. But the higher level cars with slicks suffer. The oval cars go from cold grip, to just right and then bam the grip just falls off. Supposedly this is from the aero and current tire physics combined...or so some say. I don't know for sure, but I do know the grip can just fall off at certain points. But the tire tweaks they did on the Star Mazda, Indycar and C6.R helped a lot, but I didn't like the C6.R. If feels 'disconnected' like the star used and still does a little. The indycar feels great to me, though i haven't put a lot of time in it yet. Mainly just the past 2 days.
I really can't wait to see if they apply the tire physics 'tweaks' next season and how things will change. I am also waiting to see how LFS does their new tire physics and also finally get to drive that scirrocco. Good stuff coming from all directions in sim racing and hopefully 2010 is going to be a great year for LFS and iRacing!