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).
HTC has released a whole slew of kernel source files for the 2013 version of the One today, following the gradual rollout of Android 4.4.2 to the device around the world. There are, frankly, too many variants to name in this post individually, but some of the highlights include Vodafone UK, AT&T, Sprint, O2 in Germany and the UK, and a number of unlocked variants. The screenshots below tell the full story.
In case you need more proof that the new HTC One is the worst kept secret in mobile tech since the Nexus 5, we offer People's Exhibit
A W. This video gives the Verizon-branded M8 almost 10 minutes of time in the spotlight and provides a really good comparison to the first-generation HTC One.
At this stage, there's very little we don't know about HTC's new flagship. Nevertheless, the company is set to debut the M8 to the world tomorrow, and the device should be on sale soon after the press conferences.