The first wave of Android 4.4.3 KitKat OTA(over the air) updates have been rolling out to Nexus and Google Play Edition devices by T-Mobile.It comes with build numbers KTU84L for Nexus 7 and Nexus 4 and KTU84M for the Nexus 5.
The Android 4.4.3 KitKat will bring performance improvements, stability and bug fixes. The Nexus 5 has also received an improved dialler with updated interface showing images of the contacts and speed dial contacts in the dialler app.
Indeed, Android 4.4.3 KitKat update is an incremental update from Android 4.4.2 KitKat bringing many security enhancements and various bug fixes. The new update is expected to include fixes for data connection loss, random reboots, missed calls and various camera bugs. Other than existing bug fixing, the Android 4.4.3 is said to not bring anything significantly new in terms of features and UI interface.