The Android 4.4.3 update is finally baked. Google made the Factory Image available for download. This one is designed for the Nexus 5, the Nexus 7 (2013), Nexus 7, Nexus 4 and Nexus 10. These images are 440MB to 465MB in size and will require fastboot set up to install. This update includes a few new tweaks and enhancements: the dialer app has new color accents and a card-based process for speed dialing, there is a bug fix related to CPU usage and the Nexus 5 camera. These factory images are obviously perfect for those who don't want to wait for the OTA.
Here's the link to the factory images: https://developers.google.com/android/nexus/images
Speaking of OTA's, the 2013 Nexus 7 WiFi-Only version is already receiving the update push at the time of this story. Users can expect to get it anytime with the next few days. For some reason, the LTE version of the 2013 Nexus 7 is not yet supported by this update.