Android 4.4.3 firmware images
appeared on developers.google.com

Supported devices: Nexus 4, 5 phones and tablets 7, 10.
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According
to the Android Police website, the changes in the firmware are as follows (this applies more to Nexus 5):
- Correction of the error of disabling data transmission;
- correction of an error related to the process of the camera, which affected the battery charge;
- Fix focus in normal and HDR-modes;
- other fixes in the camera;
- correction of the problem associated with the transition of the device to the "deep sleep" mode;
- some fixes in Bluetooth;
- fixes a random device reboot error;
- Correction of errors when shortcuts disappeared from the desktop after updating the application;
- security fix for USB connection;
- elimination of problems with automatic connection to Wi-Fi;
- Fix hangs in MMS, Email / Exchange, Calendar, People / Dialer / Contacts, DSP, IPv6, VPN when activated;
- Correction of the LED-indicator in the case of missed calls;
- correction in subtitles;
- correction in the display of data transfer statistics;
- corrections in the work of Internet telephony;
- fixes to comply with the requirements of the Federal Communications Agency (FCC).
Thus, it is clear that the changes relate mostly to stability and security and do not carry any new features.
At the moment, you can download the system image and flash directly with a very desirable preliminary backup. Or, preferably, wait for a quick update by air. Fortunately, there is nothing particularly interesting in the firmware.