I'm 99.99% positive this is the exact same chassis. I placed the two versions into layers on Photoshop, and everything is identical and lines up perfectly with Gen 1. All they did is change the front and rear, and at that, it's only paneling cosmetics.
I do have to say though, it is a much improved style. Interesting how it gives the "appearance" that the chassis has a lower roof line, but in fact it most definitely does not. The rear hatch comes out more and the spoiler combo with the face-lift rear fenders and two-tone paint makes it look like a different roof line.
Also, not sure if anyone caught that the battery pack looks to be identical dimensions as Gen 1? I can't wait for a retrofit option. We'll all be able to make our Gen 1 Leaf go 150+ miles. That's one of the perks I've been trying to sell people on with these electric cars. Likely Tesla will also make us a battery one day as well.