http://www.techradar.com/news/we-may-get-the-samsung-galaxy-s9-before-the-galaxy-s8-gets-android-oreo

Samsung has yet to announce a launch date for the Android Oreo update on the Galaxy S8 and Galaxy S8 Plus, and it means we may see the Galaxy S9 launch before they're even upgraded.

In a message to Galaxy S8 owners signed up to Android Oreo beta, the company said it's "doing its best to distribute the official version" of the software to the phone.