Android 4.3 isn’t the latest version of Android, but it’s a newer version of operating system. This software update for HTC One mini brings with brings with him also the HTC Sense 5.5 witch is present now on HTC One devices in October.
Other improvements you can find into Video Highlights section. Now you can add a sound to videos. Also, the music interface was also changed.
Initially, the update will be available in only few countries, and after some time will be available for download worldwide. To see if it`s already available for your country you can go to Settings -> Software update to make a check. Be careful; make this update using a Wi-Fi connection with at least 50% charged battery.