
Players will now have access to multiple hotbars in the GUI. Up to ten separate hotbar banks will be able to be visible in the client GUI. The number visible will be able to be customised from the options menu.
Each bank maintains its ten lines of slots, so in total that's ten bars with ten lines of ten slots. This means you'll be able to have a hundred icons visible with a thousand that can be cycled through.
You will be able to toggle which of the ten bars is currently your active hotbar. (i.e. which hotbar accepts the keyboard shortcut commands)
For other details on 17.4, see here:
http://www.athenpaladins.org/forums/vie ... php?t=2620