Only speculation but I'm almost certain what we are looking at is just a mirror like removable sticker tape that is simply hiding a split window like the last one.I don't see that window sliding down guys, look at that divot in the fwd portion of the box... how is the window gonna clear that? Also, to dispel myths, the tail gate is exactly the same.
Maybe that back window tilts in? There goes me hauling 16 foot long 2x6's lol j/k
Yes, they do look quite low. There is a compensation effect when your minimum ground clearance point is closer to the wheel rather than the center line of the vehicle. However, in this case, those long control arms are perpendicular to the direction of travel and will become problematic in several situations: gravel or dirt roads with deep ruts you can't avoid, heavy unplowed snow or snow berms to catch those control arms, and general off-road travel on uneven terrain. Some here object to the characterization, but Honda may indeed be delivering a "street truck" or "city pickup" with the next gen RL....the rear suspension control arms seem to be about 6-7 inches above the ground...
Tonneau, yes, but maybe not a cap/canopy. Several aftermarket makers quit making the shells for the RL due to low sales. If the G2 RL has some cab-to-bed quirks as has been hinted, there could be some significant challenges to designing a well-fitting canopy for it. The truck needs to sell well and generate enough owners wanting canopies to create an aftermarket demand.The flat rails seem 'ordinary' but then a nice cap/tonneau is probably already on some aftermarket mfg's drawing board.