I retired my Note 4 and now sport a great Moto XPE, which should get the Marshmallow goodness pretty soon, unfettered by the whims and bloatware of the carriers. The Note 4 never got 5.1.1, probably because 6.0 was so close to coming out. But Marshmallow is still at the mercy of the carriers. So I wouldn't look for any N4 Marshmallow gooeyness until at least 1st. quarter of 2016, if not later.