System stability updates and nothing more.
An update to the firmware of the Wii U is now available to download.
Going into the System Settings menu and selecting System Update will start the five-minute download and installation process. According to Nintendo, the update is only for "improvements to overall system stability."
The scheduled spring system update, mentioned in the January 23 Nintendo Direct conference, is still due to arrive sometime in April, and will include new features and faster load times for system-level applications.