I'm not thinking that battery replacement would be seen as a way of recharging or be done on the road. It would be infrequently done, when a change in capacity/technology is required or the module is worn out.
The interface specification could go beyond the electrical, including things such as heat removal.
Today: "Nio Power" has gotten a lot further, with more cars and a chain of robo-garages to do the swap in a couple of minutes.
(Still a single unified module, but it's not clear anyone needs to manage several-hundred-pound modules just yet, maybe when it scales a bit more...)