You can now create folders to sort and organise your software, they are very similar to the folders on the Nintendo 3DS. They’ve also added a download management icon directly to the Wii U home menu.
The Quick Start Menu which was added in the last big update has been updated as well. You can now get the menu when you use the TV Remote function of the GamePad and you can now hide certain software from showing in the quick start menu from within the power settings menu.
The HOME menu has also been updated, but I am not sure to what extent (my update is still downloading). A small but nice update to the eShop includes the disabling of characters not used when redeeming Nintendo eShop cards. (O, I, Z etc).
And of course there’s improvements for stability. Everyone loves stability.