Owners of the new Nexus 7 started receiving an unannounced update of their devices, bumping Android to version 4.3.1…
Source: http://www.phonearena.com/news/Android-4.3.1-update-surprises-Nexus-7-2013-owners-rolling-out-now_id47971
Source: http://www.phonearena.com/news/Android-4.3.1-update-surprises-Nexus-7-2013-owners-rolling-out-now_id47971