Nintendo's Support Page gives us a few details on what we can expect the newest system update to include. There are the usual things of course, with updates to the system's stability and usability, and some of the menus are getting updated as well.
But then there's the bombshell, the huge thing that will change the (gaming) lives of all Wii U users around the world: users can now create folders in the Wii U menu, in order to organise their icons. We'll call that progress people!