HTC M8 已进入认证阶段. 而M7已经进入发布阶段.

http://www.htc.com/uk/go/htc-software-updates/#device-content
HTC One (M8)This device is currently has Lollipop and is in the 3 - Certification stage of the Android Marshmallow Release.This device currently has Sense 6.
注: "3 - Certification stage", HTC升级流程:http://www.htc.com/uk/go/htc-software-updates-process/
根据网站信息来看, 居然是M7最先升级, M8/M9应该是第二批.