My .02: I will be interested to see if Lexus USA improves this car for 2023 and 2024, or just considers it a "set it and forget it" from the 2022 model year on with no further R&D value considering the upcoming switch to electric.
Lexus has historically made YoY improvements to F cars for spring rates, transmission tuning, suspension calibration and unsprung weight, so it's easy to see how some minor changes would go a long way with this car. I see a ton of potential for the IS 500 -- almost more than an F car because it exists in a gray area -- but I can also see where maybe Lexus wouldn't see that value.
The IS 500 has been an absolute slam dunk so far and I really hope they carry support for the car as long as possible. It's created nearly the same level of enthusiast engagement and fanfare as the IS F, which did wonders for Lexus.
For 2023, I could see Lexus: adding the oil and trans coolers, changing the brake pads, switching tires, retuning the suspension slightly? We should know more soon...