I'm still bummed out that we never got to see the Lexus LC F.

That prototype you saw was in fact the LC F. There was also a LS F in development too (the LC F was more far along, the LS F would have come a bit later). Lexus was supposed to bring back the IS F, and GS F with this twin-turbocharged V8 and the next RC F was going to have this too. Heck, there were rumors that the LF-1 was going to have this V8 too. All of those are dead, and they will not come back. There were rumors of a new Lexus twin-turbocharged V8 since the early 2010's and Lexus enthusiasts have been strung along for about a decade. In 2019, we started to hear rumors of the twin-turbocharged V8 surfacing again and it was supposed to debut with the LC F. It was going to be some \~660 horsepower asphalt-eating monster. Those prototypes you saw were the LC F, as well as a race car that was spied. The original video of the LC F race car is now removed from YouTube but Kirk Kreifels clipped it on his channel. The LC F race car was in development for the 24h of Nürburgring. It was set to race the 24h in 2020. Need I go on what happened in 2020? As a result, Lexus shelved development of the LC F which the road car was becoming more production ready by the day (and the race car was 100% ready), and cancelled the LS F as well. The rumors for the IS F, GS F, RC F, and LF-1 (well the LF-1 was never even built but rumors suggested that Lexus would finally build a rear-biased crossover SUV) using that V8 also slinked away into oblivion as well. It was sad to see them put so much effort into this V8 but not use it in the end. As an aside, Toyota was morphing their legendary TS050 Hybrid endurance race car (i.e. the most successful car in WEC history) and were developing the GR Super Sport hypercar (we're talking \~2018-2020 here). 2.4L twin-turbocharged V6 hybrid monster ready to compete against the Aston Martin Valkyrie, the Mercedes-AMG ONE, and the McLaren Speedtail. Development was going extremely well for the Super Sport and Toyota even opened up a wait list for interested and \*loyal\* Toyota/Lexus buyers so they could start selecting people to buy their cars, meaning you weren't going to see annoying rich billionaires with no history associated with Toyota/Lexus get their hands on these. During development, one of the test cars caught on fire in the most spectacular fashion. Toyota, being the risk-averse company that they are, pulled the project completely. That's all it took. All it took for Toyota to pull the project was one incident. Done. As a result, they had a load of development money lying around so they reallocated that money into developing the LFR and two other cars. The other ones being the Lexus Electrified Sport Concept (late 2020's/early 2030's) and the A100 Toyota GR Supra (\~2027/2028). The V8 was back into the fray, this time in the Lexus LFR. Though now, there is a hybrid component. Sources from Japan say that this is going to be a \~1000 horsepower twin-turbocharged V8 hybrid. Toyota benchmarked the Mercedes-AMG GT, and even fielded an AMG GT3 race car in Toyota's Rookie Racing team in the Super Taikyu series. For those who don't know, Rookie Racing is the brainchild of Toyoda-san and other Toyota/Lexus enthusiast-minded executives now that Gazoo Racing has gone international. The LFR is a race car first, then a road car. This follows the promise of the new wave of executives that they're going to develop their sports cars as race cars first, then release them as production cars. As for regular cars, they will try to imbue them with lessons learned from racing. The LC F and other cars are dead, and the LFR rose from their ashes. Now, people around the Lexus camp were suggesting that if the car does well, it can be possible to bring back the twin-turbocharged V8 to other Lexus models, but for now, just assume that it's going to be in the LFR only. As for the Lexus 86 (or Lexus "UC")... not happening.