
HTC America president Jason Mackenzie just announced on Twitter today that the Android 4.3 update for the Verizon version of the HTC One will be delayed by a month. Specifically he said,
One Vz customers: we need more time to spin new SW & re-test 4.3 update. Approx a month. Appreciate your patience as we work to deliver
Other than alluding to needing to be baked a bit longer, no details have been revealed as to the cause of the delay. Of course, for Verizon customers, it's become par for the course as Big Red's vetting process for new updates is notoriously longer than their competitors.
Source: Twitter - HTC