HTC might have stated that it plans to brings Android 4.4 update for HTC One unlocked units within a month in US but the HTC One models in EMEA region will have to wait for full three months to get this update.
The company told Android Community that they’ll release Android 4.4 for the One in EMEA countries “from the end of January.” With this revelation, we know HTC One update schedule in US and EMEA countries but the company is still silent about the update plans for Asia.
HTC has also not revealed a clear timeline for One Mini and One Max Android 4.4 updates.
To remind you, Android 4.4 will come with Sense 5.5 to the HTC One smartphone. Android 4.4 as such packs several improvements and you can read about them in detail in the posts given in story timeline.