Samsung rolled out new Beta programme for s8 & s8+ which has oreo update in it. Programme is for everyone who own a s8 or s8+ world wide. 
Enroll for it very easy you can download the Samsung+ app from the Play Store to register your phone with Samsung and become eligible for the beta. There are only 10,000 slots available, so be very fast!

NOW LET’S TALK ABOUT THE CHANGES 

1. Most obvious change – System information 

S8 software experience is much smoother on Oreo. After the update. Size of update will gonna be 1414.67 MB.

2. Big Changes in keyboard app

  • Major performance improvement and improvement in text prediction.    
  • Four new high contrast modes which will help in recognize different parts of the keyboard more easily.
Now you can select from these four options in your s8 . Resizing is now whole lot easier than past.
  • New GIF and Emojis support
Now we have new emojis 5.0 support and gif inside the keyboard



3. Notification Changes


i. Notification categories

More granular and consistent control over which notifications can appear and how intrusive they are.

ii. Notification snoozing
Lets users hide notifications for a period of time, similar to Inbox snoozing.

 

4. Edge Lighting Feature
s8 & s8+has edge lighting feature from its launch and with oreo update it getting better , now you have multi-color effect option. You also have the option to tweak the width and transparency of your edge lighting effect to see how dramatic and obvious the notifications are.


5. New About Phone 
Samsung redesigned the tab “about phone” similar to MIUI phones . It is looking more organised than ever. 

6. Dual Messenger Feature

This feature is very useful when you more than one account for any social media app.

Once the feature is enabled, you will notice a little orange icon in the bottom-right corner of the app icons, this indicates the secondary account.

7. Other Changes 

Accessibility
Accessibility services can optimize the audio experience for users with disabilities. Allows you to quickly access from the navigation bar accessibility features, like magnification, and functionality within accessibility services, like Select to Speak.

Adaptive icons
Developers can now provide a full-bleed square shaped icon and OEMs will mask the icon to ensure intra-device consistency.

Background location limits
Limits the frequency of location updates in the background for better overall sys Accessibility button

Linkable files
API that allows you to share files across the Internet via web links.
Native C/C++ API for high-performance audio
API function for high-performance audio including Native C/C++ audio API.

Pointer capture
Pointer capture allows the app to capture all mouse input.

Project Treble
The biggest change to the foundations of Android to date: a modular architecture that makes it easier and faster for hardware makers to deliver Android updates.
source – google 

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