We can’t confirm (nor deny) that this update would be for Android 6.0, but it does seem unlikely at this time. These phones are currently all running Android 5.1.1, so the update could be more about stability. If the update is for Marshmallow we don’t expect it to be ready for a while yet. Maybe Samsung is shooting to be the first OEM to bring Marshmallow to their devices. We would love to see that.