Last week we heard a beta program for Android 8.0 on Samsung Galaxy S8 is about to start It should be available for starting tomorrow, and now we got intel on which countries will get early access to Oreo. The first wave includes South Korea, the United States, and the United Kingdom.
There is also a second wave of markets which would get the to beta-test Android Oreo. The countries are Germany, Spain, France, Poland along with India and China.
To test the beta version, you must be a member of the Galaxy Beta program, available through the Samsung Members app. The start and availability will vary by region, meaning more countries may try Android Oreo in the foreseeable future.
Source (in Dutch)