Android 4.2.2 update hits the international version of the HTC One
The update also allows you to work with native Android sound profiles via equalizer controls. Next to the battery level, you can set up the phone to display the percentage of battery life remaining by going to Settings> Power> Show Battery Level.
This update is for the unlocked international model only. Those with an HTC One tied to a particular carrier will just have to wait. The carriers have to test out the update first before they give it the green light.
source: AndroidRevolution via SlashGear