Android 4.3 is an incremental update, but still it brings a few noticeable improvement. It delivers more toggles for quick access to oft used settings in the notification shade, and you can add widgets to the lockscreen. HTC BlinkFeed is also updated to integrate with Instagram, and you can keep track of your friends updates there.
In the camera, you lock focus and exposure on a specific point. Then in HTC Music and HTC Zoe, some photographic features have been improved. Again, nothing major, but a nice and relatively quick little update.
The HTC One is the only premium Android smartphone from a well known phone maker to ship with an aluminum body, and it's now available for $120 on sale at Amazon Wireless.