With the Ethereum mining boom exploding and creating a black hole for all Radeon RX 470/480 and RX 570/580 graphics cards, AMD has a massive inventory of Radeon RX 460 graphics cards that the company will be upgrading to the purported Radeon RX 560D.
The news is coming from MyDrivers, which is reporting that the Radeon RX 560D will have 896 stream processors, meaning the RX 560D is a simple rebrand of the RX 460. MyDrivers says that the new Radeon RX 560D will use up to 50% less power than the RX 560, which could make it perfect for mining. If you had 6 x RX 560Ds per machine and had many of those machines... well... that could be a cheap little power efficient beast for ETH mining.