One of my all-time criticisms of Blizzard's design. Give us new, unique creatures and denizens. Yes, it will require a new rig. Ok? Anything that screams BRAND NEW UNDISCOVERED LAND, not "You know this game's all about reskins, right?"
Same with cave layouts, etc. Does it make sense that this new, untouched, heretofore unseen realm has roads, roadsigns, and ever-lit torches on every path? Many small design things in the aggregate. I get it, it's easier to reskin/color stuff.