This morning Google began pushing out an OTA update of Android 4.3.1 to its 2013 edition Nexus 7 tablet. While an update was expected for the device, no one expected it to release this fast and with no announcement. The update began being pushed to Nexus 7 devices late last night and is only available for the 2013 Nexus 7 at the moment.
The update is still very much a mystery with no change log being released, and no information anywhere on what new features it may contain. We suspect that it is just a bug fix update and that it is the result of Nexus 7 owners not being able to connect to Verizon's LTE network. The update itself is just 9.42MB in size, so slight and small changes to code are most likely the only fixes that have been applied.