This time Samsung is providing Android Marshmallow to its old Galaxy Note 4. Maybe, Galaxy Note 4 is lucky or Android Marshmallow is lucky that Samsung is providing an update.
Some users are reporting that their Galaxy Note 4 is receiving Marshmallow upgrade. Later reported via Sammobile, it is said that exynos variant of the phone is starting to receive the update. The update including Marshmallow weighs 1.3GB and bumps the operating system up to version to 6.0.1.
Also the detailing of the update says that it includes April Security update along with it.