The Chinese offer is in conjunction with YvesSaintLaurent, which isn't quite in the same arena as Apple's (Product) Red variant of its iPhone 8.
The new photos were posted on Twitter and Weibo, and seem pretty legitimate, so it seems that the new shade is coming.
But where it will be appearing is the big question – these seem to be for China only at the moment, and the burgundy version of the Samsung Galaxy S8 only appeared in South Korea and India.
It's always curious to see how brands (other than Apple) limit the colors offered to different regions – surely this would be a popular choice worldwide?
It's also interesting that Samsung is releasing this option so close to the launch of the S9 pair – the burgundy S8 didn't appear until much later in 2017.
We'll keep an eye on whether this lands in other parts of the world, but for now it seems that the YSL deal is keeping this fancy color locked to China.