Seeing as the phone is about a year old, I doubt that. Eligibility for upgrades amongst S6A owners is non-existent at this point, unless they bought the device outright or paid off the device early. There really is nothing in Marshmallow that is a game-changer for 99.9% of the phone users, so there's no point in crying about not having it. The only reason to upgrade to the S7A is that it's the phone the S6A should have been, and that's only something that hardcore enthusiasts would even contemplate doing.