ANYBODY CAME ACROSS THIS YET? http://www.gsmarena.com/htc_one_m8_gets_treated_to_a_minor_software_update-news-8358.php
The update for sprint came out a couple weeks ago, version 1.54.651.8. Same update as the one you posted.
Pretty sure, and the pictures on that post are from a different model, you can tell by the icons in the notification bar. I may be wrong.