This is just my 2 cents but I believe that when they add the huge graphical overhaul, they'll allow for an option to play in the legacy version under the Graphics Tab (kinda like being able to turn Post Processing on and off - tho this might require a full restart of the game if and when u switch) so that players can choose to enjoy the nostalgia when they want.
I feel it is going to be several toggles, to be honest. It doesn't seem like it's a full graphical remaster but rather a lot of rendering improvements.
Quote"It's not a remaster, but we've really focused on modernizing the experience and reacting to the big influx of new and returning players around the anniversary, and finding all the limitations the game had with modern PCs,"
Kryth Builds You can find pictures of the graphic redesign via the thread on IGN (link to first post). It's a redesign in the sense that it adapts to 4K screens and PCs that are more recent than when GW was released, including the interface (UI), in terms of resolution (pixels). That's it, there's no need for an option to go back, it's useless.