It looks like Nintendo is working to improve the Wii U’s stability and fix some minor bugs ahead of E3!
A new firmware update is now available for Wii U owners. The update to version 5.4.0 U brings “further improvements to overall system stability and other minor adjustments”; additionally, European owners have noticed that the update removes Nintendo TVii from their consoles. While the update doesn’t change anything major for most users, it is required if you want to use many online services (like the eShop), so you’ll probably want to download it soon!
— NiNTENDOMiNATiON (@TiLMEN) June 9, 2015