How do I get Android kitkat 4.4?
This is really just if you want to do the upgrade manually, now. Google's own devices (the Nexus range) have always received the latest OS versions sooner or later over the air (called "OTA").

Actually, they've started seeding it now, according to Team Android on an article published November 15th:


  The new WiFi version Nexus 7 2013 can now be updated to Android 4.4 KRT16O KitKat OTA software update. The official Android 4.4 KitKat has just begun rolling out to users starting today and Google will be pushing out this firmware update to everyone in the coming days.