It was rumored a couple of months ago that Samsung might offer a violet color option with the Galaxy S8. We even saw leaked images of a purported Galaxy S8 in violet before the flagship was officially announced by Samsung. Violet wasn't among the color options officially confirmed by Samsung on March 29 but it appears that there may be hope yet for those holding out for this color.
Samsung Brazil has listed a Clear Protective Case for the Galaxy S8 on its website. The case is being offered in Black, Silver and Violet colors. It's not a typo because the color dot is also violet or “Violeta” in the local language.
However, clicking on the dot brings up the Orchid Grey model in the photos instead of a Galaxy S8 in violet. So either this is a placeholder or someone over at Samsung Brazil is just trolling people.
You should keep your fingers crossed if you'd like to purchase the Galaxy S8 in violet, who knows, Samsung might launch it eventually.