Samsung Galaxy S8 is a 2 year old device and has already received two major OS update Oreo and Pie. As Samsung only does 2 year support or 2 major OS update, S8 may not get Android Q unless Samsung think of doing something different and updates the S8/Note 8.
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my galaxy S8+ got the one ui 2.0, im not sure where you guys get your information from, but it sure as heck doesnt seem like its from samsung itself. reading peoples posts on the web hoping to find answers, its all a joke. just wait for samsung to make a post about it. no need to tell people they will or not. you dont know that unless you work for samsung.... and as far as i can tell its still up in the air if the galaxy S8, and S8+ will get android 10 or not. doesnt matter how many os they release, its 2020 you never know what samsung is capable of.