HTC One M7 developer edition is starting to receive Android 5.0.2 update which includes Sense 6.0 ROM. The update is 702.52MB in size, as AndroidPolice reports, and it does indeed update the device to Android 5.0.2 complete with Sense 6.0 UI. The update is version number 7.17.1540.7.
HTC is putting its accent on a new lockscreen and the notifications interface, it allows Recents to scroll multiple pages and it allows for searchable settings.
Considering that we are talking about HTC here, you should expect some AOSP and Sense mix in the update as well.