A brand new OTA began rolling out to the 2013 Nexus 7 LTE just two days ago, and today those changes finally appeared in AOSP. As is the tradition, Al Sutton built a list of changes and posted them to his site. Every bug fix and tweak from KOT49H (4.4.2_r1) to KVT49L (4.4.2_r2) is included. There isn't a lot to look at, but if you're interested in what's new, you can find the developer changelog here.
With a new Android release comes another one of Funky Android's crazy-detailed AOSP developer changelogs, this time detailing every commit made between Android 4.4 (build KRT16M) and Android 4.4.1 (build KOT49E).
As usual, it's really long, and for the most part full of fairly cryptic comments you may not understand unless you have a pretty deep familiarity with the Android OS on a technical level. That said, there are always some interesting, readable tidbits people manage to pull from these logs, so if you can make the time, it may be worth perusing through for some unadvertised goodies packed in Android 4.4.1.