Good news to many who own the wifi Nexus 7 2013.  A pre-rooted stock KitKat 4.4 has been released by Scrosclar from XDA Forums. http://forum.xda-developers.com/showthread.php?t=2534816  

[ROM][11/19/13][Flo] – {Latest OTA} – Stock Rooted 4.4 – KRT16S – First KitKat Update

rooted 4.4 Nexus kitkat