I would say the test truck in the video has a cabin that is clearly open to the bed area (above the seats). But more telling as to what this might become is the look of the bulkhead between the bed and cabin (immediately aft of the rear seatbacks). It's thick looking in a way that makes me think it's not fixed to the sides of the vehicle. I believe what we have here is a motorized bulkhead that adjusts from a large crew cab pickup with a 6-foot bed to a work truck with an 8-foot bed. It is likely the climate control can heat the entire vault too which will allow it to replace a lot of large SUV's. Whatever is going on here it's leveraging the construction of the Cybertruck and its electric powertrain to do things no traditional pickup could possibly do. The limitation of a traditional pickup when it comes to things like this is the frame is flexy and twists on uneven ground causing the bed and the cab to move independently of one another while the Cybertruck will be solid and rigid with very minimal flex, even with 3500 lbs. of payload inside. That rigidity is what allows Tesla to do things no one has attempted previously. In mild weather, the Cybertruck will also be able to operate in modes that would cause carbon monoxide poisoning if it had a tailpipe.
I truly believe that Tesla is creating a wondertruck here that will stun the world with its jaw-dropping functionality and all-around abilities. Not just specs on paper but real-world awesomeness. Even some diehard TSLAQ are going to want one of their own once they pick their jaws up off the ground. Unfortunately, most of them won't have a spare $60K laying around. This will likely become the best-selling pickup in America.
Yes, it has slightly softer lines, smaller, less aggressive wheels and tires, and is a little more compact overall but it's still a very large vehicle on the inside and versatile in ways people have only dreamed of. Until now. Legacy pickups are going to quickly look very 'frumpy' to most people.