In the same code there were hints at unreleased mobile GPUs from AMD, the R9-M380, M390, M395, M395X, and an Intel Iris Pro 6200 which is already on the market.
Why Apple is still doing business with AMD is beyond me. nVidia's GPUs are so much more powerful while operating at a lower TDP, and Apple's terrible cooling design in the iMac isn't helping either. Both the CPU and GPU are known to thermal throttle themselves before they overheat and shut down because of Apple's desire to make a thinner desktop. IT'S A DESKTOP YOU WANKERS. IT DOESN'T NEED TO BE THIN OR CARRIED AROUND. PLEASE. STOP IT.