Read on youmobile that samsung has confirmed that the note 4 will get the android 6.0 M by the end of the year when google releases the full version later this year!!
Let's not even start this conversation. Yeah, everyone will either want it to fix their other Samsung phone, or they will never trust another update after LP. WAY too early for these rumors.
Most of the problems should be fixed when 5.1.1 rolls out, I can say that the only problem I have has since lollipop is battery life but I use power saving mode and the battery has been lasting longer.