I originally thought that the ZF was going to replace the 66RFE (gas motor), but I've been told this will replace that as well as the 68RFE while the Aisin will be available for the trucks with the longer rear ends/max towing. Matter of fact, ZF recently retrofitted this 8 speed on a 2015 Ram 3500:
https://www.equipmentworld.com/test...line-transmission-aims-to-dominate-class-5-8/
I have more info on the HDs and some other stuff which I'll post later.
Edit: just saw Haywaj's post about the same thing (guess I'm late to the party lol) but I'll be posting more info. Just want to make sure my source would feel comfortable revealing certain things to the public.