Earlier today, HTC Product Manager Mo Versi tweeted that the Android 4.4 KitKat/Sense 5.5 update for the HTC One was approved by Verizon. He also said the update would be rolling out shortly. While many would assume this means days, the update has gone live. Verizon posted the changelog and the update is being rolled out to HTC One owners today.
Let us know if you received the update!