The first rumors about the Rose Pink Galaxy S8 have begun in early June this year. This variation only seemed logical, because Samsung have brought it on all of their high-end smartphones. Also, at the first time, this color variation is available at some markets, and after that is gets global availability.
The Galaxy S8 already has a Rose Pink variation only in South Korea, so logical move will be to get released worldwide. The whole worldwide releasement of the variation might begin from Eastern Europe.
It is still nothing confirmed from Samsung, but they will surely announce something pretty soon in a connection to this topic.