Wii U system update live NOW (July 10)

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SOURCE

However its not the big "summer" update.

Version 3.1.0 U available via wireless Internet connection includes the following improvements:

Improvements to Standby Functions:

• The standby functions will now regularly connect to the Internet when the Wii U is powered down to check for available SpotPass data or software and system updates. Software updates will be installed while the Wii U is powered down, and system updates will be installed the next time the Wii U is powered on. For further detailed information, click here.

Improvements to system stability and usability:

• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

*A system update providing further additions to system functionality is planned for release between the end of September and beginning of October.

Looks like the bigger update is coming at the literal end of Summer.