Compared to my RX with V6, I had the chance to test a new NX with smaller engine (not turbo) and plug-in, and I was well impressed, mostly because it works in EV till higher speed so that thermal engine is off most of the time, but when it goes on the noise is quite low, so to not regret the V6 sound; the question about 2,5 turbo is how it is reliable compared to aspirated 3,5 V6; for sure it's less thirsty, anyway I am satisfied of mpg in my RX.
About new platform, it's firmer, a bit more rigid, and I found very good in NX test, so I guess will give same feeling in new RX.
Would I change my V6 for a new 4 cylinder RX? I don't know, probably YES but with a fear to regret something , even if probably I would take an aspirated 2,5 as power is sufficient to me.