would love old zones being levelscaled. Don't really think they need to revamp zones except maybe the 1-60 cataclysm zones as their so devisive story zones.
Mostly the zones just need levelscaled with hopefully a new questreward system and they could just bump up the textures quality. Maybe redo a few terrain and tree textures.
redoing terrain and vegetation textures does wonders for the look of a zone.