They added the Mono like I was hoping, so there goes my big #1 pick.
More Focuses would be nice. Throw some Fiestas in there if you have to. Important cars.
More Daihatsus and more Porsches (especially older ones) would also be nice.
I'd love to see two Daihatsu models in particular: the Charade Group B Rally Car, and the second-generation Copen. Especially the GRMN-labeled model, for the latter. Some Focuses would indeed be nice, too, and I'd be extremely surprised if the latest (and seemingly final) Focus RS doesn't come to GT7 at some point or another. I'm also hoping the Mono is complimented with similar cars it can be competitive with, like the Ariel Atom. Both could also race against the LCC Rocket, if that car is to return.
How about some of the new 2022 Rally1 WRC hybrids?
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It'd be real cool to see hybrid rally cars in GT, but I'm not sure if the WRC license would be an issue. (See also: the fact that the Ford Focus and Subaru WRX both had WRC-licensed rally cars in the PS3 era, but were seemingly replaced with made-for-game Gr.B versions in GT Sport.) That said, I'd be estactic if PD made a Lamborghini Huracan Gr.B Rally Car modeled on the Huracan Sterrato. Which, by the way, is seemingly going into production.
That said, I find it very interesting that some of the most famous automakers from the real-world Group B era don't have any representation in GT Sport's Gr.B, like Renault. Either that, or there are plenty of real-world Group B rally cars that appeared in prior GT games that, for some reason, did not appear in GTS at all, even though they'd likely be a fine fit for Gr.B, namely the Audi Sport Quattro S1 that was actually used in Group B (versus the Pikes Peak version we can see in GTS), the Peugeot 205 T16 Evo II, and the Mitsubishi Starion 4WD. Indeed, I'd love to see more Gr.B rally cars, especially from Ferrari, Lamborghini, and Porsche.