ArcCorp and all the planets and their moons have vastly different atmospheric densities. Will the new flight model take that into account, as well as the difference in density at ground level versus the edge of space?
TL;DRYes, atmospheric density is modelled with a simplified exponential falloff, so low flight gives strong lift and blackout risk, easing with altitude into space flight.
So basically the simple answer is 100% yes. It's really, really cool. I'm really happy with it. We have taken some compromises with respect to realism, because the way atmospheres scale off as you go higher is actually quite complicated. And so at the moment we have an exponential decrease in atmospheric density as you go up, which is somewhat realistic, but it's not realistic because of all sorts of weird physics things. And so as you fly lower, I think the easiest way to see this is if you take a really aerodynamic ship like the Gladius and you make a tight turn low in the atmosphere, you will get some really strong lift forces, such that you can black out really, really quickly. And then if you fly a little bit higher in the atmosphere, that eases off and you can turn harder and use your thrusters a little bit more and not black out as much, because there's not as much air. And then as you get right to the edge of the atmosphere, it scales into what is effectively space flight in a nice, smooth transition. It's really, really cool. I'm really pleased with it.