Nintendo has released a new firmware update, v5.2.0, for the Nintendo Wii U tonight which along with the system's now infamous "stability" updates also includes a new feature carried over from the Nintendo 3DS: folders.
The patch notes can be found below
Changes to the Wii U Menu
Folders can now be created in the Wii U Menu to hold and organize software icons
A Download Management icon has been added to the Wii U Menu
Changes to Quick Start Menu
The Quick Start Menu will now display when the Wii U is powered on from the Wii U GamePad TV Remote
Options have been added to Power Settings that allow users to hide certain software from the Quick Start Menu
Changes to the HOME Menu
The design and layout of the HOME Menu has been updated
Changes to the Nintendo eShop
Disabled usage of characters not used when redeeming Nintendo eShop cards (O, I, Z, etc.)
Improvements to system stability and usability
Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience
The update should now be available for all Wii U owners once you turn on your system. If not, it should be rolled out later during the day depending on your region.