Take everything that you have in your head regarding the performance of the 1GR on a 200 and throw it out the window when discussing the LC300 with the same engine.
The 1GR LC300 drives way way way better than the 1GR LC200, it is not even close. You wouldn't believe its the same engine.
The 1GR LC300 GX ( the most basic version) thanks to the weight loss is actually pretty quick right now!
It can do 0-100km/h in less than 8 seconds ( mid to high 7s in optimal circumstances ) and is very peppy on highway speeds and can reach top speeds ( in Mexico

) that would shock you, and very quickly too. Not bad considering its still a heavy/large vehicle and the engine only produces 271hp/385nm.
I am not exaggerating, I owned a GRJ200 and a GRJ300, the GRJ200 was a slow cow, the GRJ300 is anything but, and it so much more fun in the dunes too.
I just had to put this out there, because I was shocked when I experienced the GRJ300 myself for the first time, even though its the same engine without any performance upgrades on paper but it feels like a different animal in the LC300.
To put things in perspective, I own a 1GR GRJ300 GX as well as a 2014 LX 570, I prefer driving the LC300, so much more nimble, not as cumbersome or big to drive, and I reckon it could keep up with it or not far from it until easily well into highway speeds ( obviously a 5.7 is still more powerful the faster you go and the torque is something else, but you get my point), that's how much better the power is now optimized with the LC300.
When you see how much better a carryover 1GR performs on the LC300 vs LC200 can you imagine if they carried over the 5.7....oh man, that would have been a dream.
Whatever you guys end up getting will definitely be great to drive if the LC300 is anything to go by.