Hyundai Ionic 5N 2024: As mentioned previously was revealed during the GTWS finals.
Gran Turismo F3500 -A: same as above, along with a special race series in the same vain as the DTM events but with half of the field having GT3 throwback liveries.
Mercedes-Benz CLK-GTR Strassenversion: Will complete the 90s Hypercar trinity, the W 196 R was completely unexpected and I suspect this one would be widely received with high praise. Also fits in with the stats posted by Famine as it's:
1. New to the series.
2. Would be the second most expensive Legends car added at atleast $12 million.
3. Classed as a roadcar and has very good racing pedigree when looking at it's dominating racing counterpart.
I imagine the performance being in between the F1 and 911-GT1 Strassenversion. To me personally it's like the JGTC class before they added the Castrol NSX, it's pretty obvious the GT1 era class is missing it's main competitor when it comes to the road cars.
4. Mercedes-Benz are clearly very proud of this car and even though they no longer have any roadcar chassis at the their Museums I imagine it can't be too hard for PD to get their hands on a privately owned one if they really wanted to add it.
The fourth car I predict will be a newer road car of some sort, possibly a BMW or Porsche. Wouldn't be surprised to the see them add the Ferrari Purosangue as Kaz did say GT would be receiving more SUVs.