Update: Google has begun pushing out the Android 4.4.4 over the air update to the Nexus 7 (2013) LTE. The update is a tiny 2.4MB, and shouldn’t bring anything new besides bug fixes. If you can’t wait to get the update, you can flash the 4.4.4 factory image (see below), though that means starting over with a fresh system.
It’s been three months since Google released Android 4.4.4 factory images for the Wi-Fi Nexus 7 (2013) and several other Nexus devices. Now the LTE version of the Nexus 7 (2013) is finally getting the same treatment.
Android 4.4.4 is a release focused on squashing security vulnerabilities, including several bugs related to the notorious Heartbleed flaw in Open SSL. If you’re into the nitty gritty stuff, you can find a full changelog here.
The factory image will only be useful to you if you tend to experiment with custom ROMs and the like, and need a stock image to revert back to.
Head over here to download the factory images for the Nexus 7 (2013) LTE.