However, fleetingly mentioned at the beginning of the post is the following interesting tidbit:
This isn't something that's been explicitly clarified before now. There's been some talk that there would be a way to switch between the old and new models but we hadn't heard exactly how that would be done. It seems we now know: just set your graphics to "low" and it will enable the old player character models. If you've been nervous that your beloved main of many years might be changing irreversibly, hopefully this allows you to breathe a little easier. There'll be a way back!