Toyota claims about 29 inches of articulation on the 300. That seems unrealistic. But if you combine that with the wheelbase it calculates out to 732 RTI score on a 20° ramp. I think the GX is going to be identical. So the extra 2 degrees is rounding, tires, or??
I don't think the 300/lx will be protected anymore. The LX is not a halo off-road vehicle anymore. Arguably it's not an off-road model at all. It has less clearance than a Rav4. And the base model likely has less articulation than many current Toyota models - need some tests to see.
As far as pricing - you can't compare to markets that include VAT or on-road fees. We know the Prado is slightly cheaper than the 4runner in markets both are sold in. The 4runner is the obvious guide to USA pricing. I think it'll be significantly overlapped between them. LC is unlikely to match Sequoia pricing. So about 55-70k.
Come to Qatar
Let me take you out to the dunes and show you if the LX 600 is a real off road vehicle or a raV 4

.
The LX 600 won't have less articulation than a 570 that's for sure, even without AHC, because that's the same suspension setup as the base 300 and that has excellent articulation. An actual ramp test would be an interesting test to do, maybe I'll do one someday!.
The top trim Prado in Japan is $51k USD. That's inline with the top trim 4runner. They're the same car with different sheet metal. Pricing is going to be nearly identical. Next generation, who knows
There are some price caps IMO. The bronco raptor is $85k, but it's realistically $20k away from a 350hp LC250. And the Sequoia TRD pro is 77k and it's the hybrid. The equivalent LC will be at least $5k less is my guess. Probably closer to $10k less. I think it tops out about $70k with ttv6. If it's only 4cyl - 65k max.
The LC is a reskinned lc300. So, is a reskinned, reskinned lc300 a real Land Cruiser if the 300 is really just a baby Sequoia anyway?
The LC300 being the flagship product, came first ( was the first TNGA-F product to be developed ), then everything else was developed around it.
The 250/300 will evolve and develop in the future and will without a doubt remain for future generations. I hear an all electric GX successor is already in the early development stages ( mentioned on some forums).
The question is, will the Sequoia last beyond this generation?
Sales are so low compared to the 150/300 and without a doubt the 250 will end up selling more than the Sequoia too. They saved the Seq from the axe once, will they do it again?
We still don't have full year Seq sales because it hasn't been exactly a year since it went on sale, but I really have a feeling it won't survive a next gen.
My guess is, the LC300 replacement ( LC400) will grow in size a little, not a lot but think Y62 Patrol/US Armada size ( and soon Y63 ). With the LC250 being 300 sized, I see room for that to happen now, especially since a lot of LC300 owners are actually complaining it feels to tight inside.
All I can say is what a time to be BoF Toyota fan.