If you don't want to wait for Android 4.3 Jelly Bean to hit your HTC One, you don't have to. Android developer LlabTooFeR released his MaximusHD ROM, which includes a leaked copy of HTC's own 4.3 update, complete with Sense 5.
This will only work on GSM models of the HTC One. That means AT&T, T-Mobile, and International versions can get 4.3 ahead of time. This will NOT work on Sprint or Verizon models.
I have only tested it with the AT&T version of the HTC One, and not the International or T-Mobile version. It should work fine, though, but your results may vary.