I can happily deal without a newer V8 Supercar for a while. Don't forget we still have the XR8 that's been in the game since GT3.
However I would at least like the FPVs that were in GT4 back. And maybe a few new Australian cars. Even if it's just a VE/VF GTS and a FG GT or something. I mean we have 30 or more versions of the skyline (I'm not silly but we don't need 8 or so variants of the R34)
I don't ever expect to get some classic Australian metal in the game (XW GTHO Phase III, HK Monaro GTS, XU1 Torana etc.) but if it happened it'd be awesome (especially if it was the 'Last of the Big Bangers' VK)
Cmon PD just have a chat with Peter Champion. I'm sure he'd help you out with some HDT gear