I agree, there's no need to change the frame or basic cab structure. It's plenty capable for introducing to the US market, and there's room to increase capability for future generations.
There's definitely going to be new drivetrains, you can count on that, but if the pictures I've seen are any indication the exterior is going to be largely the same as the current ROW truck. I hope I'm wrong about that. Not that I find anything wrong with it but it's not what corporate has been promising since January.