It's not hard to say that its only high-end phones that will receive a Marshmallow update. While several users have waited to know if Samsung will give their phones a Marshmallow update.
Several rumors of the past have already suggested that Samsung has its roadmap for the Marshmallow update, but it looks like things have changed. A list of its devices and handsets that will receive the Marshmallow update has appeared online. However, official sources confirm that Samsung never releases such lists, so its better to ignore such lists if you came across one.
However, a source that is knowledgable about Samsung's Marshmallow update has said that Samsung Galaxy Note 5 has been delayed to Q1 2016 from December 2015 . It can be noted that all budget friendly Phones unlikely to receive Marshmallow update
A list of Smartphones and Tablets rumored to receive the Marshmallow update has appeared online. Samsung will begin the rollout of Android 6.0 Marshmallow in Q1 2016 for the following phones: Galaxy Note 5, Galaxy Note edge, Galaxy Note 4 (DUOS variant too), Galaxy S6 edge+, Galaxy Note edge+, Galaxy S6 edge, Galaxy S6 (DUOS variant too), Galaxy S5, Galaxy S5 Neo, and Galaxy S5 LTE-A.
Samsung will give Android 6.0 Marshmallow updates for the following devices: Galaxy Alpha, Galaxy Tab A, Galaxy Tab S2 9.7, and Galaxy Tab S2 8.0. This is more likely in the Q2 2016.
The list that appeared online states that the dates for the updates are only "estimated", which means that the list and the dates can be changed any time. The list could also get longer, which means that a lot more devices and handsets are likely to be added to the list in the months to come.