Following word that the update to Android 4.3 for the HTC One was hitting some phones in Taiwan, we have just grabbed the 564.04MB update on our unlocked Developer Edition. The update to software version 3.22.1540.1 brings all of the enhancements of Android 4.3, along with improvements to HTC's Sense 5 customization. This falls right in line with what president of HTC America Jason Mackenzie stated earlier this week, and if all goes to plan we'll see other models get the update soon as well.
We're also hearing reports of other unlocked international versions pulling down the updates. If you have an unlocked or Developer Edition of the HTC One, you may want to grab your phone and check for the update now — and let the rest of us know in the forums how the update goes.