I can only speak for the PC version but the interface has had a complete overhaul. Everything is now categorized better. Stuff like weapons, armour, bombs, potions etc have their own sections instead of being lumbered together. New character screen, you can see defence and offence stats better, can see what armour looks like without equipping it. Books, journals and quest letters now have their own glossary section.
Biggest change is probably the world map, you can zoom out further, filter quests, exploration, areas of interest, shops etc. Different types of map markers, you can use up to three, I think. All round it's just much slicker and has actually helped massively in organising things to do.