Yesterday, OTA update download links were flying out for Nexus devices to update to Android 4.1.1 (build KOT49E). After only a little wait, the download is now also available for the Nexus 7 WiFi (2013) model, so go get yourself the newly updated Kit Kat.
Download Link (55.3MB)
In order to sideload this, you’ll have to be running stock KRT16S. Sideload instructions can be found here.