Android is one of those things that never changes, and yet it does. Sure, it is a great open-source operating system available on many devices, but several Android smartphones and tablets don't have the latest version of Android with 6.0 (also known as Android M or Marshmallow). With the announcement of Android N (also known as Android 7.0 and Nougat), there is a lot of talk on who will get it first, and it could be Samsung. This is what is known about Android M Version 6.0 Marshmallow and Android Nougat Release Date for Samsung Galaxy S6, S6 Edge, S6 Edge +, Note 5, Note 4, Note 3, and S5 on Verizon, US Cellular, AT&T, T-Mobile, and Sprint.
As far as any news about Marshmallow on any current Samsung devices, there is not a lot of news happening on it this week. Honestly, a lot of the current Samsung devices already have it, and the recent release of the Galaxy Note 7 have certain cranked up the expectation when it comes to new versions of Android.
In fact, a recent report from the International Business Times reports that the Note 7 could be receiving its Nougat release date before the end of 2016. It is actually pretty rare that this happens, as usual Samsung products get their upgrade at the beginning of the year after the announcement of the new version. For example, Android Marshmallow didn't come out on Samsung products until the beginning of this year (with some showing up at the end of 2015), and Marshmallow was announced at Google's I/O in the summer of 2015.
If Android Nougat does come to the Samsung devices (any of them) before 2016, it would be a first time that Google's Nexus series didn't receive the upgrade first before other manufacturers. Gotta Be Mobile states that Nougat will be coming to the Galaxy Note 7, Galaxy S6, S6 Edge, S6 Edge +, Galaxy S7, Galaxy S7 Edge, and the Galaxy Note 5.
So, as far as what happens with the release of Android Marshmallow, the previous mentioned Galaxy Note 7 has it out of its packaging, along with the S7 and S7 Edge. Several products from years ago, such as the Galaxy S6 and S6 Edge, it has it on all carriers. The other Galaxy S5 flagship has showed up on Sprint, T-Mobile, and Verizon.
If you own a "newer" Samsung devices are encouraged to check your "Settings" and "System Updates" to see if Marshmallow is ready to download OTA. This upgrade might not be ready depending on your U.S. carrier, as it has been shown that certain carriers receive the Android upgrade before others, with no real pattern.