All item icons have been improved in this update. (This does not apply to building and object icons.)
some models of some items have been changed, e.g. a water bottle - it has a completely new model
some items received new textures in higher resolution
half of the artifacts received new visual effects
Fixed a bug that allowed equipping an item from the quick bar when player didn't have the required stats for this item.
You're probably wondering why I don't detail which items received what. Because I'm lazy and don't write down the details of what I'm changing. Especially since there were about 400 icons.