There is no floor, that's just the x-y axis of whatever program that is. He's showing off the lighting engine-- compare the top and bottom pictures. The shadows and stuff are not hard-painted into the texture like they are currently, they're rendered.
It's really really impressive, nice work
I always wished AH had stuff like ambient occlusion
I don't know if maintenance crews painted over the windows out of a drunken stooper of if they were taken out all together. But they went from a dark blue to black. Since it still looks like there is supposed to be light coming through them, I think they would look better as a soft white.
Also, there is no alpha set for the windows.
Headline:
AH BBS readers score 0% on state mandated standardized testing for reading comprehension
I think this is why HTC is so sparse about its in-progress screenshots