Build is JZO54K
Reports suggest this minor update fixes bugs and performance issues, such as bootloader crashes and colour issues. Landscape mode has also been added to the stock launcher!
The folks over at XDA have pulled the OTA .zip from the Nexus 7, which can be flashed through ClockworkMod 188.8.131.52. TeamWin Recovery appears to not flash the update at this time.
I've already flashed the update through to my Nexus 7, and I still have root plus an unlocked bootloader.
Here is the information from the build.prop:
Details in the following link!