The Settings/battery section is different on my replacement Note7. The power saver modes are not changeable, the GUI is all different and you cannot put app to sleep anymore.
No, I checked and I still have the option to change power saving modes and I can put individual apps to sleep.
This article on ZDNET talks about several Other changes that are included in the updated software.
Samsung Galaxy Note 7 software update: More than just a green battery icon | ZDNet