Android 6.0 Marshmallow, first known to developers simply as Android M, is expected to be released along with the 2015 next-generation LG Nexus 5 and Huawei Nexus 6 devices this fall. But which Android flagships are getting the latest sweetly named version of Android after that?

Here's how the Android 6.0 Marshmallow update might spread across Android world after its initial release.

First, the official word, of which there is very little so far (unsurprisingly). In its latest mid-August post, announcing the official Android 6.0 Marshmallow software developer kit (SDK) and the launch of the final version of the Android M Developer Preview, the official Android developers blog mentioned only a broad release date window for the final, consumer version of Android 6.0.

In fact, it made mention of one single word regarding Android 6.0's launch: fall.

"Remember that when Android 6.0 Marshmallow launches to the public later this fall, you'll need to manually re-flash your device to a factory image to continue to receive consumer OTA updates for your Nexus device."

And...

"At the consumer launch this fall, the Google Play store will also be updated...."

Any Android fan already knew that, but clues to which smartphones will be first in line to get the update to the full consumer release version of Android 6.0 Marshmallow -- after the presumed release of the second-gen Nexus 5 and Nexus 6 -- can be found in the devices that are currently running the Android M Developer Preview: Namely, the 2014 Motorola Nexus 6, the 2013 LG Nexus 5, the 2014 HTC Nexus 9 tablet, and the Nexus Player streaming box. The Nexus family, minus the middle-child Nexus 7.

Whether Android 6.0 Marshmallow is released to those devices in reverse order of their release is unknown, but the Nexus 6 and Nexus 5 are pretty good bets for first in line.

After Nexus, the roll-out is much more up-for-grabs, though to be sure, devices like the 2015 Moto X "Pure Edition" and any other Android smartphones that run an OEM-unmodified version of Android will get the update faster than those that have to wait for Samsung or LG to add their UI skin to it before rolling out the OTA update. Devices from the now-defunct "Google Play Edition" program, however, like the Samsung Galaxy S4 or HTC One (the first "One") may be getting too old to be anywhere high in the queue.

Remember, Android 5.0 Lollipop took more than three months after its initial release in early November to make it to most of the current flagship smartphones. Older or less "premium" phones are still behind, judging by the latest official Android Lollipop adoption figures for September.

As of last week, Android Lollipop (5.0 and 5.1) only make up 21 percent of the Android universe, total, so if you're not running pure Android on a two-year-old (or less) device, the prospect of getting Android 6.0 Marshmallow anytime soon is kind of grim.

Google could always surprise us, though, so fingers crossed.