Just yesterday we reported on a leaked internal Sprint memo which indicates they planned to push out the Android 5.0 Lollipop update out to the HTC One M8 on February 13th. It looks like they moved up their time-table by over a week. Sprint just announced and starting sending out the Lollipop update this morning to the HTC One M8.
The firmware version for this Android 5.0 on the Sprint HTC One M8 is 4.20.651.10. This update also removes the Lumen toolbar from the device. This now means that Sprint owners of the HTC One M8 and the HTC One M7 will soon get to taste some Lollipop!
Source: Sprint