halle tak main "Sant baba lak tunu tunu" ji ton diksha nahi layi iss kar k supne nahi le sakda ki tuhade kol kaun sa Galaxy hai te na he update baare bhavishyavani kr sakda.
Jedi list main uppar share kitti c unha layi pakka aau, je tuhaade H/S layi lollipop 5.1+ update aa gayi hai then most prolly you'll be updated to Marshmallow otherwise chances are very bleak.
yep, the said device shall be gradually updated to Marshmallow but not before early 2016.
My pure assumption is based on the fact that, if your Samsung device is less than 1.5 years old, then brace yourself and have hopes because the devices in this breed always gets updated to latest versions.