I apologize in advance for resurrecting this topic since it brings out a lot of emotional responses, but I am in a position to emphatically say that there will be a 6th Gen 4Runner. I was recently invited to participate in a couple of styling exercises with Toyota. I am under NDA so I will tiptoe around some details.
Timing: Direct quote, "we are three years out", so I anticipate a release in late 2020 as a 2021 model. This lines up with some of the speculation I've read on this forum based on known release dates of other models.
Mechanicals: All indications are that it will be based on the same 150 platform as the 5th Gen. Another direct quote, "it will be the exact same size as the current generation", which reinforces the speculation that it will be based on the 150 platform. Plus all the exterior styling artist renderings showed running gear that looked exactly like the 5th Gen. No discussion of engine.
Exterior Styling: Those who like the rugged appearance of the 5th Gen will not be disappointed. There were four different versions shown that ranged from mild to wild on my scale and all of them were what I would call "bold". Common themes of all of them were large front grill, very modern looking lighting (front and rear), much more aggressive flares (some versions more than others), very good front and rear approach and departure angles, barn door type rear hatch and rear hatch mounted spare tire. My feedback and that of others that I was privy to was 1) do not lose the retractable rear window, 2) keep the lift gate if you can, but keep the retractable rear window at all cost, and 3) if you must move the spare tire to the rear, use the space opened up underneath for additional fuel capacity. All of the styling studies reminded me of an updated 4 door FJ Cruiser.
Interior Styling: Much more car like, but also much more refined than the current interior. It appeared that many of the hard switches and buttons will become soft switches on the large center display screen. My feedback, and again that of those I was privy to, was there was a disconnect between the rugged exterior styling and the (too) refined interior styling. Recommended using large buttons and dials rather than soft buttons on a glass screen (have you ever tried to press a button on a screen when bouncing down a trail or dirt road?).
Again, I am under NDA, which I don't feel I have violated with what I have shared, but this is the extent of the information I am comfortable sharing at this time. What we see in three years may or may not be what I saw, but I'm confident it will be very close. I am also very confident there will be a 6th Gen 4Runner and it will be body on frame.