A now-removed post on the official Taiwanese Facebook page has suggested that the release date for Death Stranding is November 8, 2019.
The post was noticed and screen grabbed by Twitter account NanoGuidingStar, and brought to wider attention by famed games Twitter account Nibel. A second source provided another screen grab of the post, this time from a mobile account. The post has since been deleted by the PlayStation account, and so there is currently no way of verifying if this is a genuine leak or a hoax. As such, this should absolutely be considered a rumour for now.