Carmaker1 predicted a new Toyota Land Cruiser would be arriving to the states for MY2024. This sort of matches what you are predicting.
In addition, we know the international Prado is going to be totally redesigned soon. And as we also know, the GX is based on the Prado and thus is also getting a redesign.
According to Carmaker1 the GX is supposed to become more rugged so that it can compete better against the Defender and G-class.
My speculation is the rumored MY2024 Land Cruiser coming to the US is just a Toyota-branded GX or USDM Prado. It will be a less luxurious version of the upcoming GX, however, it will still keep the more powerful powertrain and greater off-road improvements. Perhaps the V35 engine, triple lockers, etc.
This makes sense as the 4Runner can continue to be sold in its class. Then the new Land Cruiser can compete against the more capable Bronco and Wrangler.