Android 4.3 ROM for the Nexus 4 has leaked. It's the same build that we saw recently appear for the Google Play Edition of the Samsung Galaxy S4 and the new nexus 7 ... i will wait the pipo and ainol tablet update to 4.3
in the nextbuying site link
7 Inch Tablet, Best 7 Android Tablet for Sale,Cheap Android 7 Inch PC | NextBuying.com, Android build JWR66N. You can download the system dump and have a look for yourself. A flashable zip has been made and a guide is available