I think he means the "Raceroom Group C" playlist on his channel, which he probably just quickly made to confuse us (but I still hope it's not just a macabre joke).
Nope. It was orginally built on a GT2 base but later run with SP9 specs, although it never got homologated afaik. So it's going to be in both classes.
I also spotted "look to apex" and the option to set ABS, TC and SC separately instead of using "get real".
Option to disable replay saving, more cockpit cam settings. Also possibility do disable factory TC and ABS
I hope we will finally get it at least near the end of the year. Georg showcased SP multiclass first in April 2016 if I remember correctly, and even then they wrote "it has been in development for a while".
Multiclass in single player has been possible since 2015 in dev builds thanks to a special launcher made for developers. Then @Robert Holm laid out the code support for it which is what you see currently in multiplayer. We are only waiting for some time available where we can get the UI done and out of the way. We have been busy on various tasks that took us away from certain things.
I believe we can make a pretty good guess at what the WTCR circuit will be considering that we are only missing 4 from the calendar. 3 of them are city circuits, I feel that they are not very likely but they might very well surprise us. This leaves us with the last one which is Ningbo International Speedpark. The WTCC did race there in 2017 and the WTCR is racing there at the end of September, which also happens to be when they hope to release the WTCR pack. Maybe they plan to release both at the same time. I'm just specualting because it's fun
Multiclass is not os much important than an AI selector which lets you select whichcars from the class you selected are locked out. To realise something like that there is no need to take 2.5 years.
Did you actually read what J-F wrote? They need to implement an UI for that (as well), but they get constantly sidelined. Some folks in higher ground have other priorities, so be happy and join all the cool competitions (or like me wait for ACC)