You could just wait for the reviews.
I mean, this is true, but it would still be nice to see Polyphony actually speak for themselves and show off the truly new features that GT7 is bringing to the table. Showing the truly new features of the game, features that make GT7 more unique compared to previous entries, is especially important for people like me, whose desire to buy GT7 directly influences my desire to buy a PS5.
So far, in terms of actual gameplay and features, GT7 seems like it's mostly filled with enhancements to things found in previous games. The map menu system harks back to GT4. The scapes system, which "started" in GTS, are a series of continual enhancements on GT4-6s photomode. The vehicle class system (which stills concerns me regarding its implementation) is something directly from GTS, etc. None of these are bad things
per se, but it doesn't do anything to really set the game apart from older titles.
Things like improved AI, multi-class racing (how this isn't a thing with PD's close ties with Super GT and VLN, I have no clue), and a greater presence from the aftermarket scene (which I would expect in a game that claims to represent car culture) would do a good bit to get me excited. These are things that PDs competitors have done, and I have a hard time believing PD isn't capable of at least
trying to implement these things. So far, the only new content we've gotten are some new cars, tracks, (polarizing) revisions of classic GT tracks, and some Music-Rally-Mode-Thing. 2 of those are the bare minimum expected for any sequel, one has the community somewhat split, and the last one was mentioned for a second with next-to-no details on what it was, like it was a fleeting thought that just popped into Kaz's head.
Also with reviews, while they are very useful, they are ultimately a representation of someone's subjective takes on a game, and something a reviewer doesn't like could be something that gets no more than a shoulder shrug from me (NFS Paybacks speedcard upgrade system springs to mind). It would be very nice if, alongside reviews, PD did more to tell me what sets their game apart, as well as what they want GT7 to be. Because if PD can make it interesting, then I'm more likely to get it, because they did their job in convincing me to spend money with them.