I visited the factory a couple of months ago. Gary gave us a very nice tour. He allowed us in to the "secret" area, to see the new coupe. He made us promise not to tell anyone, though.
No pictures allowed.
I was pretty impressed with the new chassis. Rather than modifying the existing frame, they started with a clean sheet, and did a complete do-over. 7 times stiffer! That's pretty amazing, since it was pretty stiff before. It not only looks more solid, it looks lighter (but not sure about that). The engine bay is easily big enough to swallow a supercharged Coyote.
Windows are the same as before. No roll up.
Gary also mentioned that would be building some complete cars. But only for the overseas market. They didn't want to complete with the network of builders around the US.