Both the Wii U and the Nintendo 3DS have received new firmware updates.
The Wii U update is 625MB and apparently takes around 45 minutes to download. This update addresses system stability and is also said to improve the sluggish menus and reduce loading times on certain applications.
The 3DS meanwhile brings the system version to 4.5.0-10U and includes "further improvements to overall system stability" as well as making "other minor adjustments" to "enhance the user experience."
That'll be a busy morning of downloading for Nintendo fans then.