Android M, or Android 6.0 Marshmallow as it was later revealed, has rolled out to Google's Nexus family of devices and a few OEM smartphones like the Moto X 2015 Pure Edition, but Samsung has yet to begin a wide release of the OTA update.

A few Samsung owners have been lucky enough to be part of the company's limited test pool, though, and now it appears even some carrier versions of 2015 Samsung flagships are getting Samsung's beta Android M upgrade. The latest "leak" showing details on what Samsung's version of Android 6.0 Marshmallow portends comes from an owner of a Samsung Galaxy Note 5 on AT&T, according to Droid Life.

Screenshots from the unnamed owner of an AT&T Galaxy Note 5 that was part of a small Android M beta test group shows a few changes coming to Samsung's custom TouchWiz UI layer.

It's not a huge facelift, but a little can go a long way. If you own a Samsung smartphone running Android 5.0 Marshmallow, and are sick of that version's blue-dominated TouchWiz theme, for example, you're in for a nice change of pace. The screenshots show that most of the blue UI elements have been changed to grey, while Lollipop's secondary yellow accents are now blue.

The leak looks pretty legitimate, as one screenshot includes the build number (N920AUCU2BPB1), version number (6.0.1), and file size of the firmware package, along with the AT&T demarcated device model number for the Galaxy Note 5.  

Of course, some person on AT&T with a Samsung Galaxy Note 5 getting an early preview version of Android M isn't as exciting as your Samsung device finally getting an update release date for Android 6.0 Marshmallow.

Luckily, if another recent Android 6.0 Marshmallow leak -- purportedly Samsung's latest rollout roadmap for 2016 -- is to believed, the Samsung Galaxy Note 5 should be getting an update release date this month. Other major 2015 and 2014 Samsung devices will get their due in the months following, if the leak is accurate.

Nothing official has been confirmed or announced yet, so as always, take everything with a healthy grain of salt.