Its raining lollipops for sure. The likes of Motorola Moto G II Generation, Nexus 5 have one way or the other received the Android 5.0 update and the likes of LG G3 and Motorola Moto X are slated the get the same in the coming days. Even Sony to their credit did showcase the AOSP build of their KitKat update, with HTC also committing to releasing the Android L Update, things are definitely moving forward and fast.
HTC’s Mo Versi, member of the HTC Product engagement team took to Twitter to confirm that HTC will also start rolling out the update for the Google Play Edition devices, including the HTC M8 and M7, starting next week. It is not clear whether both the M7 and M8 will get the update at the same time or one after the other, but it is clear that both the devices will be getting Android L. It makes sense that the rollout will be this quick given that all the Google Play Edition devices run Android 5.0 in unadulterated form.
In case you are not patient enough to wait for an OTA to your HTC M8 for Android L, you can use the firmware that developers have already uploaded on XDA for the device. The thread can be found here.