It has been a while since Nintendo has released an update to the Wii U (August 17th 2015 to be exact). This new update is said to be adding further improvements, stability, and other minor adjustments. A lot of things could be said about whether this update prepares the Wii U for the upcoming Nintendo Account announced back in October. But for now, enjoy your super stability!
Source: Nintendo
I’m still waiting for the firmware update to have more slots to hold more games that are downloaded. As of right now I can’t download anymore games for the Wii U. all slots are full, even though there are in folders.