Only concentrating on the GUI here, no commands or anything like that, although I personally think there should be a lot of commands added, but thats for another post I believe.
http://www.mmorpgs.org/gui-changes.JPG
Personally I dont like the draggable windows too much, but many others have suggested it. I do not like the new NW-added map-things there though, the buttons are huge and their purpose hardly of any use (exception is the "checker" button) and would love an option to turn them off.
The other options in there are options either already in game but enhanced/moved or simply added somewhere else as well.
NOT DEPICTED ::: I would also love a DEF-value. We have an ATK-value, but I would love a defense-value as well, listing our DEF-rating.