Pictures of the Sapphire Radeon RX 590 Nitro+ Special Edition have surfaced online. The exact specs of the card are still unavailable but we should be knowing more information close to the official announcement on November 15. The RX 590 is based on the new Polaris 30 architecture, which is being made in a 12nm process. Sapphire and other AIBs have retained the existing RX 580 designs for this refresh.
https://www.notebookcheck.net/Pictures-of-the-Sapphire-Radeon-RX-590-Nitro-Special-Edition-surface.357636.0.html