The new Galaxy S8 and S8 Plus Oreo beta brings along the October security patch with new features and changes. It improves default launcher and stability of DeX mode, brings new clock styles for the lock screen and Always On Display. Users can now adjust the transparency of notifications to get their desired look. The changelog also mentions tons of bug and errors fixes.
Android Oreo Beta Features for Samsung Devices
Apart from the Android 8.0 Oreo Goodies including new Settings and Notification panel UI, Picture in Picture (PIP), Adaptive icons, Autofill, Notification timeout, Samsung has add several new features to the Samsung Experience 9.0.