As per the update notification, it brings Android 4.3, battery charging animation in power off state, improvements to colour contract in images taken in low-light conditions taken by HTC One camera and ability to add soundtracks in video highlights.
In related news, Jason Mackenzie, President of HTC America, took to Twitter to reveal that HTC One dev edition will also start getting the Android 4.3 update this week, followed by release for regular HTC One in Canada in September-end.
There is no word on update roll-out for other countries right now.

2 replies on “HTC begins Android 4.3 update roll-out for HTC One”
@gauravshukla Any news about india? when will #android 4.3 comes to india for #HTCONE.
Any new that HTC one update in india,..????