It’s worth noting that the 675LT was immediately bettered with the 720S, and now the 765LT. While the 765LT represents the final ICE (other than a 785R) solution before the transition to a genre that is not 100% well received. Indeed, not everyone likes the electrification of cars (plug-in, hybrid, etc). In fact, by my estimation, most do not. This is not carburetion giving way to EFI, or a manual tranny to paddles. This shift is much deeper and more unpleasant. The best/last of an ICE breed will protect the 765LT somewhat. Of course, what matters most is how good the car is. Will it be a performance monster? Will it gather a strong following? That remains to be seen.Anyone saying it will hold value better than the 675LT is not really looking at McLaren's history. The initial values are driven by instant demand within the first year. As the flipping stops and the initial "I need to get one now" feeling goes away, the values will start to drop. New cars will come out. The super rich people will sell them to get the new cars. The 2-5 year range will see a huge drop. What matters more to me when we talk about value is the 5+ range. This will depend very much on how people view the 765LT in the lens of historical McLaren cars. The 675LT has an inherent advantage because it was universally loved (read all the reviews - almost all saying this was the best car they had driven up to then and was the 4th fastest car to 124mph behind the 3 hypercars), it represents the first LT and more importantly, it really put McLaren on the map for performance supercars wheras the F1 and the P1 were great but unobtainable. It's aesthetics were also well liked - it was different enough from the 650s but not in an obvious way and more cohesive. The roof scooped ones really represented the pinnacle, the execution of which was the best integrated of all the LTs (of course subjective).
The 765LT will do well initially, the 2-5 year period I suspect will hold about as good as the 765LT. Beyond that, I think relative to the 675LT it will fall behind.
Major disclosure - I have a 675LT and I'm honest in the fact that I'm in no financial position to buy a 765LT. I don't think that invalidates my opinion, but it is a bias I note.