We have confirmation straight from HTC that their Developer Edition HTC One and their Canadian HTC One will be both be getting the Android 4.3 soon. Specifically the Developer Edition HTC One will get its update this week, while the Canadian vanilla HTC One will get it later this month. Jason Mackenzie, President of HTC USA confirmed this info via Twitter. He later also Tweeted that HTC is optimistic that the U.S. version of Android 4.3 for the HTC One will be certified soon, but didn't give any specific details.
Finally, as a quick side-story, Mr. Mackenzie also confirmed that Android 4.2.2 with Sense 5 would be coming to the Droid DNA by the end of the year. This was meant as a correction to erroneous info previously suggesting that the Droid DNA would be getting Android 4.3 later this year.
This appears to be happy news for HTC One owners and sad news for Droid DNA owners.