This week as the HTC UK announced that the update for Android 4.3 would just be hitting the UK version of HTC One, and the update would roll out in a few coming weeks.
But HTC has already started rolling out in a few markets of the continent. According to a leaker LlabTooFeR, the update is now rolling in Russia, and many countries in Eastern Europe, while the Android Central guys, also confirmed the roll out being started in some European Countries.
As far as the change log is concerned the update would bring in Video Highlights feature, some Music improvements and a few bugs that were found in the previous version of the firmware. Blinkfeed which can now also be disabled and has been made compatible with some more Social Networks.
The update measures about 675 MB and would upgrade the software of the HTC One to 3.62.401.1. The users on Carriers would be getting the update after some time.