Listen up, UK readers: if you're rocking an HTC One from 2013, and you got it from O2 or Three, check your notification bar for an update. According to this HTC support page, a fresh, steaming copy of Sense 6 is headed your way. The unlocked GSM model of the One M7 should also be getting the update. (Apparently the unlocked update is going out by country, since the US unlocked model was already updated.) Vodafone UK and EE users will have to wait.
Holy crap, that was fast. According to a flood of tips we just received, at least some owners of Google Play Edition devices are now seeing updates to over-the-air Android 4.4.3. The latest incremental update to KitKat was just published yesterday - some Nexus devices don't even have it. At the time of writing (Tuesday afternoon US) we've been told that the Google Play Editions of the HTC One M7 (2013 model) and the Galaxy S4 are receiving over-the-air updates.
HTC manages its Sense Android skin a bit differently than other OEMs do. It makes a big deal about the features each version includes, and actually updates old devices to the new UI, even if it takes a separate update to do it. The AT&T M7 got Android 4.4 a while back, but the updated Sense 6 is ready to go out today.
If you've got an HTC One on T-Mobile, whether it's the original from 2013 or the new One M8, you have a software update headed your way. Nether is packing a new version on Android, because they're both running KitKat, but new features are inside nonetheless. One M7 owners get a refreshed version of HTC's Sense interface, and One M8 owners now have access to the Extreme Power Saving mode.
HTC's software versioning is a little more complicated than it is with other Android OEMs. You might have Android 4.4.2, but be lacking many of the features found on a newer device because you have an older version of Sense. HTC can, and does, update these independently. Such is the case with last year's HTC One – some versions of the M7 are getting Sense 6 today to go with their KitKat ROMs.
You've taken the plunge and thrown down some cold hard cash on a brand new HTC One M8, but you're feeling stifled because Verizon doesn't want to allow the bootloader to be unlocked? You might want to check out WeakSauce, a handy new root exploit by XDA recognized developers Justin Case (jcase) and beaups. It's a simple tool that can set up root on both the HTC One M8 and last year's model, the HTC One (codenamed M7).