LS400 or LS500: TTV6 with 450hp, the same setup as the current LS500 but updated power output or just keep the LS500 name.I'm not sure Lexus has anymore leeway to play with the badges once more. They learned their lesson with 200t to 300 and if they are reasonable people they will not repeat the same mistake again and for sure they will not downsize the badges. 500h will remain what it is today and 600h will be more expensive, more powerful option. If it ends up being V6TT Hybrid (most likely) I'm not sure how they are going to differentiate it from the version that will go into Tundra, Sequoia, Land Cruiser or similar. Who knows maybe 600h will be V8TT hybrid after all.
LS500h: TTV6 HEV or PHEV with 500hp. It doesn’t even need to be more powerful than LS500, the hybrid would make it quicker.
LS600h: higher output TTV6 HEV or PHEV with 600+hp, maybe TTV8, but then it might as well be called LSF.
LSF: TTV8, non hybrid with 650hp, the same as LCF. It would be a performance and driver oriented car compared to a luxury oriented LS600h.
If 4 models are too much, then just remove LS600h and make the LSF TTV8 HEV or PHEV with 650-700hp.