It's that time again, boys and girls. Last week the LTE model of the new Nexus 7 got an over-the-air update to Android 4.3.1, which was build number JLS36I for that specific device. As usual, Google has posted the factory software image for end users to download and the driver binaries for developers to play with.
You can find them in the usual locations, right next to all the other current files for Nexus devices on the Factory Images and Binaries pages at Developers.Google.com. So far the LTE version of the Nexus 7 2013 are the only devices to be issued with the 4.3.1 update. It's less than 10MB for the over-the-air download and we still don't know exactly what's in it. It's possible that this update will only be release for the Nexus 7, especially considering that Android 4.4 is probably right around the corner. In any case, here's hoping the developers have fun with the new code.
Update: Peter in the comments section has the changelog. It's mostly bug fixes and other small tweaks, but it also seems to disable the native tethering function when an AT&T LTE SIM is inserted. Bad form, Google, bad form.