This is confirmed by the roadmap which shows the HTC One, HTC One Dual SIM, HTC One mini and HTC One max receiving Android 4.4.2 and Sense 5.5 in late January to mid February. The map also reveals that so far, only the HTC One has been confirmed to receive another update during late summer or autumn. This update will include Sense 6.0, along with what apparently will be the next Android build after 4.4.2.
While the roadmap did confirm the cancellation of Android 4.3 for Verizon's HTC DROID DNA, the phone, along with the HTC Butterfly and HTC Butterfly S, will receive the Android 4.4.2 update in March or April. These phones are presently undergoing testing for the update.
We should also point out that the HTC EVO 4G LTE is undergoing testing for an update to Sense 5.0, and the HTC Desire 601 is being tested for the Android 4.4.2 update that carries Sense 5.5. The roadmap did not provide possible dates for when those two units might be updated.
HTC update roadmap shows Android 4.4.2 coming soon to HTC One
Thanks, Anonymous Tipster
source: LlabTooFeR via TuttoAndroid (translated)