The number of devices running Android 6.0 Marshmallow, the latest version of Google's mobile operating system, will surely increase in the coming months as many new smartphones will be launched running this version out of the box. For older devices, though, it might still take some time before they get updated to Marshmallow. Samsung recently released the update for their 2015 flagship models, at least in some regions. Unlike other companies, Samsung didn't mention which of their phones were getting updated to Marshmallow or an estimated time-frame in which the update would be released. Some reports included leaked documents that allegedly contained such details, but there was no way to verify their authenticity.
Now, another leaked document from "a source familiar with Samsung's plans" has come to light and contains some details regarding the updating process for Android Marshmallow. The document was released just yesterday and it shows that the update will be released in, at least, two phases. Phase 1 is dedicated to updating the company's flagship models while the company will update some mid-range devices in Phase 2. Unfortunately, the picture shows very little of Phase 2, but the Phase 1 section contains the devices that will get updated and their respective model numbers, the status of the update as well as an estimated time-frame of when the update will supposedly reach those devices.
According to the document, the Galaxy Note 5, Galaxy S6 Edge+, Galaxy S6 and Galaxy S6 Edge will receive Marshmallow this month, so it seems that Samsung is ready to release the update for those handsets in additional regions. Both models of the Galaxy Tab S2 tablets, the one with a 9.7-inch display and the one with an 8-inch display will receive Marshmallow in May. Models from Samsung's 2014 portfolio, including flagships such as the Galaxy Note 4 and the Galaxy Note Edge will receive Marshmallow in April, while the Galaxy S5 is scheduled for a May release. The update for the Galaxy Alpha will be released in June. The barely readable part of Phase 2 seems to mention the Galaxy A7 (2016), so this phone and possibly a few others could start receiving the update following June.