According to the recent report from Myce, the latest Android 4.4.3 version with build number KTU83 has been sighted running on Nexus 5, which is code-named Hammerhead.





The “K” on the build number refers to KitKat. The third letter, which in this case is “U,” is the quarter that the software was written. The last two numbers is a date-code. For example, “83” would be the 83rd day of the quarter which was March 24th. That means that the build seen on the Nexus 5 is just shy of a week old. The build for the Nexus 7 (2013) was created on March 21st.

According to reports from AndroidPolice, here is the list of Android 4.4.3 fixes:

Frequent data connection dropout fix

mm-qcamera-daemon crash and optimization fixes

Camera focus in regular and HDR modes fixes

Power Manager display wakelock fix

Multiple Bluetooth fixes

Fix for a random reboot

App shortcuts sometimes got removed from launcher after update

USB debugging security fix

App shortcuts security fix

Wi-Fi auto-connect fix

Other camera fixes

MMS, Email/Exchange, Calendar, People/Dialer/Contacts, DSP, IPv6, VPN fixes

Stuck in activation screen fix

Missed call LED fix

Subtitle fixes

Data usage graph fix

Internet telephony fix

FCC compliance fix

Miscellaneous fixes

Source