Some of the very first photos of a custom Radeon RX 480 from MSI were published over at VideoCardz. The MSI Radeon RX 480 Gaming X uses the same Twin Frozr VI cooler as the company uses for its GeForce card, like the upcoming GeForce GTX 1060 model.
The card has a custom PCB with 4+2 phase power design an an 8-pin PCIe power connector. Furthermore, MSI also equipped it with a very nice backplate. Display outputs include 1x DVI, 3x DisplayPort and 1x HDMI.
Other stuff like clockspeeds and pricing is unknown. Unfortunately, availability isn't expected until the end of July.