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Just be patient, it takes a few weeks for an OTA rollout to be completed. They don’t just update every single device on day one. Some people have already gotten the update, but it’s more or less a matter of luck on your timing. Google has made the factory image for 4.4 KitKat available, so you could flash it yourself if you feel comfortable doing so. For that average user, I would say just wait a little longer. It shouldn’t be more than a week or two until you get an OTA update. Here is the link to the factory image if you want it: https://developers.google.com/android/nexus/images#nakasi