You can probably figure out most of those 68 by looking at the DR2.0 car list. I hope we see more than what has been revealed so far at launch. Just give me the 01 Focus and the Group A Escort Cosworth at launch and I'll be ecstatic. The "Builder" cars will be interesting to experience for sure.
From quickly looking at the official car list and it's empty slots vs the DR2.0 car list, it's likely most of the content will be the same.
I have tried to guess the number of new cars we're getting that weren't in DR2.0 aside from the official 2023 WRC content. I came to
23 new cars, 26 including the builders cars which seem to count as 3 on the list.
Broken down as:
2 new RWD H2 (1 of which is the Hillman Avenger)
4 new 4WD 2000s
1 new NR4
1 new FWD H2
3 new F2 Kit Car
2 new WRC 17-21 (New class)
3 new S2000 (New class)
1 new S1600
So a good handful of new to series cars, if I have interpreted the list correctly vs DR2.0.
Speculation on new cars:
4WD 2000s, I would be hugely surprised if we didn't see the Citroen Xsara, perhaps we'll get an Evo 7 and the Peugeot 307?
F2 Kit Car, Clio Maxi is a good bet as it was in Dirt 5, Xsara F2 perhaps? Was a legend in its own right. Others, unsure.
WRC 17-21, got to be the Citroen C3 WRC and Fiesta WRC.
S2000, Fabia, 207 and Proton Satria?
S1600, maybe the C2 WRC? Or the Swift?
Exciting to speculate either way.