It seems to bring major camera improvements and new features. The number of Galaxy Note 8 users are saying that this update brings Super Slow-Mo video recording function to their devices. Also, the AR Emoji stickers are there with this update.
Additionally, it brings the September 2018 security patch. The software version of this update is N950USQU5CRIA, and the size is 445.95 MB.
You can download this update manually by going into Settings > About phone > System update and download the update manually.