These are my observations since moving from D2 to DKS.
- overhauled quest rewards
- better game performance overall
- some NPCs received different heads/clothes/equipment (same voices)
- many set items and personal/class items can be purchased from vendors, as early as Broken Valley Village, and/or found in the wild.
- most personal gear, such as is found after reading minds, has been reworked
- gear is more Shiny!
- the DKS:ED campaign's end seamlessly transitions to FoV's beginning (Had it not been for meta knowledge, I wouldn't have known I was moving to a different campaign.)
- anti-dragon zones have been mostly removed from fortresses; the exception being one at Stone's fortress
- contrast improved so dungeons feel darker and outdoor areas feel brighter (still a lot of 'fog' around Broken Valley Village, for some reason)
- quest items, keys, and other special items sparkle so it's very hard to miss them (this might be part of a recent patch to both games - my memory is fuzzy)
I have one issue with DKS that I don't suffer in D2:ED...
- speech volume is not uniform; normal conversation is noticeably lower volume than that of mind reads, NPC barkers, and the speech volume indicator in game options (not an issue in D2:ED so chalking this up to an engine glitch)
Edit: I don't recall seeing any new quests prior to FoV. I was using a walkthrough to make sure I didn't miss anything. Perhaps they added more ways to solve certain quests?
