The company has also shared the source-code of Android 4.4.3 release at Android Open Source Project (AOSP). The official change-log is currently unavailable but as per US telecom operator T-Mobile, the Android 4.4.3 includes security enhancements and bug-fixes.
Online reports indicate that Google has also included a new version of Google Dialler with Android 4.4.3 on Nexus 5, which brings a tweaked user-interface and other changes.
We hope to see Android 4.4.3 OTA roll-outs for the Nexus devices in the coming days. Other manufacturers will take some time to bring Android 4.4.3 to their devices.
To remind you, this is the third minor update of Android 4.4 KitKat release after Android 4.4.1 and 4.4.2.

2 replies on “Google releases Android 4.4.3, factory images available for Nexus devices”
Moto X awaits .. fix the battery issue too!
hopefully we get the OTA from today itself!