I would love the V6TT but I do not have the budget for it. I'll wait a few years and buy it used after Toyota gets the bugs figured out 

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... all valid points.If I had to guess no deactivation because they couldn’t make it reliable. Also no part-time in large part because it isn’t bougie enough for the price point, but also having driven mine in RWD only while troubleshooting a driveline issue, frankly it is pretty sketchy in the rain with that much power and the high CoG, flexy suspension.
I'm a fan of turbo engines in general everyday use and work use. However, when it is for a vehicle named 'Land Cruiser' which is supposedly built to go everywhere and back, last thing you want is adding 'complications'.... all valid points.
Add to that that V8 are dinosaurs for today standards and even more so tomorrow. It doesn't make sense to develop a new model using something that you know is already obsolete at least in societal "perception". It doesn't matter if it has cylinder deactivation or not. That tech is also old and not flexible. It does not have the granularity and control that a modern computer controlled turbo has. The V8 is also more expensive in raw materials that the V6, larger in size and mass, more expensive to build, less flexible in use across vehicles, and I'm sure the list is not complete.