Yes, the versions available now will be very different to the cars available in just a few years. Stellantis (PSA) are already talking about the next e-208 being electric only, based on a new electric only platform.
Currently batteries add a lot of weight to protect the battery itself, but the aim is to integrate the battery into the structure of the car so 3 floors are no longer needed (battery base, battery top, car floor.. oh and the plastic shield under the lot). On top of that, the current batteries are made up of modules that are again protected by an outer aluminium shell. Maybe we’ll see the lower energy density Lithium Iron Phosphate batteries become more popular again as they are very difficult to get to burn (cut them in half & they still won’t ignite), the idea being that they need a lot less protection.