Now that the latest version of Android, version 6.0 (also known as Android M or Marshmallow) has been out for about two months, every Android user of a device that is under two years old wants to know when it will be coming to their device. When it comes to getting the latest version of Android onto Samsung devices, that can be a little difficult as the company has not given any comment on its update schedule. The company has proven that they can get a new Android upgrade to its customers quickly, but specific release dates are usually never given. This is what is known about the Android M Version 6.0 Marshmallow Release Date for Samsung Note 5, Galaxy S6, S6 Edge, S6 Edge Plus, Note Edge, Note 4, and S5 on Verizon, Sprint, US Cellular, AT&T, and T-Mobile.
According to SamMobile, Samsung has launched a beta testing program for Android 6.0 Marshmallow update for the Galaxy S6 and the S6 Edge. Part of this beta testing program will be used so that there will be less bugs, but there doesn't appear to be a plan to get this beta testing program in Europe.
Android Pit reports that they have a first glimpse of the Marshmallow infused Samsung TouchWiz UI in the form of a leaked build of the new software up and running on our Galaxy Note 5. Many have speculated that Android 6.0 will be on the Galaxy Note 5 and Galaxy S6 Edge + by the end of this year, as they are the newer devices, but this really hasn't had any kind of confirmation as yet.
Assuming that the Note 5 and S6 Edge don't receive their update by the end of the year, then it is anticipated to be in Q1 2016. Tech Radar lists other phones expected to receive the upgrade in Q1 2016, which include the Note Edge, Note 4, Note 4 Duos, S6 Edge, S6, S6 Duos, S5, S5 NEO, and S5 LTE-A. As for devices like the Galaxy Alpha, the Tab A, the Tab S2 9.7, and the Tab S2 8.0, they are expected to receive the upgrade in Q2 2016. It doesn't look like that any device older than the S4 will be receiving the upgrade.
Once the official rollout of Android 6.0 begins on Samsung products, it probably will be a slow one, and could vary by carrier such as Verizon, US Cellular, Sprint, AT&T, and T-Mobile. T-Mobile has listed its "first wave" of Android devices set to receive Android 6.0, and it includes the Galaxy Note 4.