For me
  • Improved Wallet: Holds all tokens, rather than have tokens take up inventory space
  • Wardrobe: Unlocked glamours that can be applied without saving the armor piece
  • Dye Unlockables: Unlock dye colours, rather than using items
  • Add-on support
  • High-Res Textures
  • Shorter GCD
  • Improved NPC talking experience: Ability to talk to NPC on mounts, don't have camera move when talking to Quest NPC
  • Improved Dungeon experience: Not hallways, mix up the 'formula', add some challenge