HTC One starts to receive Android 4.4.2 in the U.K., HTC One max receives the update in Europe1
Meanwhile, a tweet from LlabTooFeR suggests that the HTC One max phablet has started receiving Android 4.4.2 across Europe. The 5.9 inch device currently has Android 4.3 and Sense 5.5 installed.
If you own the HTC One or HTC One max, you can try to coax out the update by clicking on the software update button.
source: HTC via Pocketlint