Based on the pics that have come out recently, it looks like one is getting the same 1950s design, with slightly more rounded corners, and of course a glass cockpit.
Doors that close like on a modern car are mechanically impossible to do on a typical GA spamcan because the structure isn't stiff enough and isn't built accurately enough. Modern car doors work because they are within the box section based structure so everything is very stiff, and production methods ensure accuracy. Whereas the "body" of a spamcan is just one sheet of aluminium, probably about 1.5mm thick, riveted onto some struts, and no two are the same dimensions.
I don't think mogas is a starter unless you want to cripple the operating ceiling and nobody wants to do that on a certified plane.
FADEC would be good but the reliability of present stuff (Thielert) isn't great.... anyway Cessna are American and in America fuel isn't anywhere near expensive enough yet.