I received the same update on me Note 8 and was wondering what was enclosed. I must admit that why it was happening I was hoping for, at least, Android 4.2. ...but it was not to be.
Thanks to the heads-up I checked and the update was available. So Note 8 is still at 4.1.2 and no info on what was changed/fixed yet.
After playing with the Note 8 since installing the update (about an hour) I no longer seem to have the screen stutter/freeze/lack issue.
Well after several more hours of using the Note 8 with this new update to scroll through news articles and playing a favorite game I have not had any stuttering and the scrolling seems to be much smoother than before the update.
However, I have read on another forum some folks don't seem to be as lucky.