Chou shows the new HTC One M8 phone during a launch event in New York
[A Representational Image] A file photo of HTC CEO Peter Chou showing the HTC One M8 phone during a launch event in New York March 25, 2014. The HTC One M8 has a 5-inch display, slightly larger than its predecessor, as well as improved camera technology, a faster processor and updated software, the company said.REUTERS/Brendan McDermid

After releasing the Android Marshmallow to HTC One M8, the company is prepping to roll out the update to One M9 in US later this month.

HTC USA chief, Mo Versi (on Twitter) confirmed that the flagship HTC One (M9) will get to taste Google's new sugar treat flavoured mobile update by December end.

He also added that the newly launched HTC One A9, which came with Android Marshmallow out-of-the-box, will receive the latest stability update v6.0.1 in a few days time.

Key aspect of Google's new Android Marshmallow OS is the Doze power-saving feature. If the device is in sleep mode, it will automatically put apps to sleep to increase the device's standby battery life. It can extend battery life by at least 30% depending on the device's internal hardware.

Other noteworthy features include native support for fingerprint sensor input, a leaner and faster Chrome browser, more intuitive Now on Tap feature, new security-feature-verified boot system, support for more international dialects, new contextual assistance feature, Google photos and auto back-up from where all apps user data (less than 25MB) will automatically be stored in Google Drive.

Read more: Google Android 6.0 Marshmallow: 7 key features you need to know

HTC One M9 to get Android Marshmallow this month, confirms companyMo Versi (@moversi) via Twitter

Meanwhile, v6.0.1 Marshmallow will bring security patches, bug-fixes, close to 200 new Unicode 8 Emojis. It also brings back the 'until next time' option to Do Not Disturb feature, which was first introduced in Android's v5.1 but was dropped in Android v6.0.

Also read:Updated list of devices eligible for Android Marshmallow

Other HTC devices slated to get the new Android Marshmallow include One M9+, E9+, E9, ME, E8, One M8 Eye, Butterfly 3, Desire 826, Desire 820 and Desire 816.