Wii U firmware 3.1.0 U is out now, adding some improvements to the system's standby mode. Nintendo also noted a system update with "further additions to system functionality" is planned for between late September and early October - it's unclear if this is the second major update referred to earlier this year
, planned then for the summer.
In the meantime, Nintendo says with 3.1.0 U a standby Wii U "will now regularly connect to the Internet" to check for software and system updates, as well as SpotPass data. The Wii U can download system updates in standby mode, ready to be installed when the Wii U's turned on, while software updates can be downloaded and
installed in standby.
Finally, 3.1.0 U keeps it straight and true by sticking to the tried-and-tested "further improvements to overall system stability," as well as other minor improvements.