Got tired of waiting so I sideloaded 4.4 on both my stock 2012 & 2013 N7s. Apparently, Google made changes such that access to battery stats has changed and so apps like GSAM Battery Monitor and Wakelock Detector no longer work. Also, I "lost" my GPS Test Plus app - I tried to reinstall it but got the Play Store -24 error, an indication that there are remnant files left around - I believe I need to root to actually find and delete them. These are the only problems I have seen so far. Other than that, not all that different from 4.3.
Dave
Dave