Since we aren't getting any answers to these questions, I looked at the picture a bit closer with WK in hand.
When you look at the piston system, ejection port compared to the top rail, it becomes clear what this main change entails. More so than redesign the upper to have that bevel up top (which does fix the issue of things not having clearance on the top rail, as would a 1/4" bevel on the original receivers top edge) they have simply added a 0.5"-0.75" or so triangle/trapezoid on top of the entire receiver which the rail then sits on. Doesn't this means that all the AR height optics will be that additional height difference higher than designed for?. They could make a shorter iron sight and shorter riser mounts for red dots but that really doesn't work with the concept of being able to use the vast array of optics already out for the AR. If my scope was that much higher I'd be looking for lower mounts, this design basically has a .500-.750 riser permanently built onto the entire rifle. AR 45 offset irons wouldn't line up with the barrel. I was under the impression that using AR15 rail height/bore distance was intentional to keep this rifle compatible with AR15 accessories/optics.