Although, there were mixed rumors regards to Marshmallow update for Nexus 7, still the final words regard to this update were not confirmed. The official declaration turned out to be predictable somehow as Google 7 (2012) failed to qualify and the adorable Nexus 7 from 2013 graduated with honors regards to Android Marshmallow update. Sad for Nexus (2012) users, but it was on the cards due to the lack of the latest technological features inside.
As far as the Nexus 7 (2013) Android Marshmallow update is concerned, the rolling out of the OTA update has begun in spite of the fact that the tablet is more than two years old and thus a wave of delight has spread across the fans.
As far as the policy of Google regards to Android update is concerned, a change in policy has been observed in order to remove the flaws of the last updates. As far as Nexus 7 (2013) is concerned, the device received Marshmallow update in October 2015.
The latest buzz is that Google has tended to make the factory images available for software updates on its amazing Google Developers Factory Image page. You can easily enjoy the factory image in its latest version number MRA58V for both the Nexus 7 (2013) Mobile and also for Wi-Fi editions of the device.
Hope, this update, and change in policy can turn out to be a better experience for Android users.