As excited as we were for the release of the Nexus 5, we were more excited to see Android 4.4 (aka Kitkat). One benefit of a Nexus device is super fast updates and now we learn that the Nexus 4,7,10 devices will be getting the update shortly. Additionally the update for Google experience phones HTC One, Samsung Galaxy S4 will receive their updates in a couple of weeks.

Can't wait for the automatic update, go to Settings > About device > Software to check.