While Google Nexus owners are already enjoying Android 4.3 for quite some time now, HTC, Samsung, LG, Sony and other OEM customers are schedule for a software upgrade in the following weeks if not months.
For HTC One users however, the software update is already being deployed in the US for almost a week now, and is underway in Europe, according to HTC UK. Furthermore the update is being rolled out in the Middle East and Africa as well.
Back at the beginning of the month, only 1.5% of Google Play devices were running Android 4.3 version. Things could change drastically by the end of the year, if the vendors carry on with their promises.
Because this is a massive operation and it depends on carriers policy as well, the update may be not available just yet in your area (the updates will go through to November too). Please check with your HTC One phone settings, if an over the air notification for download is in queue in your region and if it is, please do let us know about it. Enjoy!
— HTC UK (@HTC_UK) October 25, 2013