HTC One (M7) users, do check if you have received the software update on your phone. Mine was updated to Android 4.4.3 with software number 6.13.707.1.
I am not sure what are the changes (except of course, the software updated to Android 4.4.3). Seems like the majority are improvements and security fixes. Some other updates include the Camera, Gallery (image match) and HTC Sync Manager.
Did you find out what other things have improved? Do let us know.