Android 4.4 KitKat was recently pushed to AOSP, and you can already find a flashable ROM for your 2013 Nexus 7 so you don’t have to wait for Google to post the factory images for that particular Nexus. Paranoid Android was one of the first development teams (if not the first) to post pure AOSP builds of Android 4.4 KitKat for the 2013 Nexus 7 WiFi version (flo), the 2012 Nexus 7 WiFi (grouper) and the Nexus 4 (mako). They posted the requisite 4.4 Gapps package as well.
It seems that Paranoid Android will now be known for much more than PIE controls, per-app dpi and HALO (among its other groundbreaking innovations). As usual, neither Paranoid Android developers, RootzWiki nor myself can be held responsible for any damage done to your devices by flashing these builds. Comments in Paranoid Android’s Google+ thread indicate there may be issues retaining root after flashing this ROM (one user said SuperSU is not working on his device but another one said it works fine, so your mileage may vary).
Now that KitKat source has been pushed to AOSP, we should soon see KitKat ROMs popping up like Orville Redenbacher’s kernels, though (as you might expect) the initial wave will be of the stock-plus variety. As for other Nexus devices, you’ll see builds for them as they become available on Paranoid Android’s Google+ post. I plead with you not to further flood that thread with “when will it be available for my device?” comments, but to go ahead and flood our comments section with reports of how it runs on your device (if it’s supported yet). Now that I’ve tested OmniROM on my 2012 Nexus 7 (I’ll tell you about that in a later article after the Nexus storm has quieted down), I’ll be testing and reporting on KitKat next.
Note: due to intense initial demand, Paranoid Android’s ROM hosting server may give you an internal server error message when you try to open the download link. Just refresh your browser and be patient – hopefully mirrors will start appearing soon. Also, one commenter said checking ‘allow apps from unknown sources’ causes settings to force close, so you may have to use adb to sideload apps.
Source: Paranoid Android Google+ thread
UPDATE: If you don’t want to wait for bandwidth on Paranoid Android’s server to free up, you can also find pure AOSP builds by RootzWiki member papi92 for the Nexus 7 (2013) (2012) and for the Nexus 4.