The update brings with it the December security patch level, as well as the Secure Wi-Fi feature and improvements for the Live Focus functionality. As usual, you can expect an assortment of unnamed bug fixed to have made the cut too.
The new firmware version is N950FXXU2BQKG but at the moment it only appears to be available through SmartSwitch.
It comes in at 3.7GB. Hopefully the over-the-air rollout is due to start soon. If you’re impatient, you can of course decide to use SmartSwitch to install the software.