Turbo/hybrid has been beat to death, but this is the first I’ve heard of unibody. Tundra/Tacoma are staying body on frame and I hesitate to believe toyota would allow them to be more durable than the new landcruiser, given its role in their worldwide market.
You sure about that?
I read somewhere (forget where) it will be TGNA-F. I'm guessing the "F" stands for a frame. Further guessing it's probably some sort of common frame architecture that crosses all vehicle platforms that use a frame.
A Japanese website claims to have insider knowledge - and they propose the 300 will come in 2021. But since @Eric Sarjeant has said 2021 will still be a 200 series model, I have my doubts.
So unless Toyota is going to trial/prove a 300 in Japan and/or Australia....