In the Korean version of the game the skill bar changed allowing to have standard buttons for the characters inventory and character screen. The Cash Shop and the Menu buttons are now clearly labeled.
Those buttons are visible in battle mode too, adding one click easy access to those screens. I don't see any practical reason to access the Cash Shop in battle mode, but you can do it now.
When a new item is added to the characters inventory a little 'N' letter indicates that.
You can see new items highlighted in the inventory too.
Additionally all items that you can't use will appear in black and white colors in your inventory.
We don't have any news when these changes will get introduced in the NA version. But probably soon™