The trailer looks great - great scenery, great landscapes, "great road surfaces", great people.
Ask them about how the bikes compare in terms of weight, center of gravity, and ride compared to typical GSs. Ask how they performed in the gravel and the dirt, DId they offer traction control settings for dirt, or wet surfaces?
The great torque of electric motors might be good or bad on slick wet surfaces or muddy paths. They didn't seem to be using dual sport tires either in the trailer. But it is hard to be certain from the views in the trailer too.
And specifics about length of ride between charges, and how long charging actually takes. Reliability too.
Total weight carrying capacity.
That's a few to get started. I might think of more later
I look forward to seeing the film September 18 on Apple TV+
I enjoyed their previous riding films Long Way Down (2007) and Long Way Round (2004) on GS's which was my preferred ride back then too.