I know nothing of iRacing myself, but the chatter on the twitch stream was that P&M won't give the devs the technical data for either the C7R or C8R so they can't happen unless they change their minds. Boo.
Apparently the Ford and Ferrari are older game models that aren't as competitive with the BMW and Porsche which is part of why they were mostly at the back. Trouble with simracing of course is that that can't ever get corrected unless they spend time updating the cars, or somebody actually comes up with a BoP setup to try to sort it out. So many multi-make sim races turn into de facto class races because of that.
Still had some pretty good racing along the way despite the top 3 domination.