AMD has released a rather big software update called Catalyst Omega. This is supposed to allow developers to optimize their games better for AMD devices. Both graphics cards and APUs are supposed to see massive gains in certain games. In day to day tasks it runs the same as compared to 14.9 with no real difference outside of specific games. I have run 2 3D benchmarks on 14.9 and 14.12 to see if there were any general improvements to unoptimized games/benchmarks, but the results were almost the same before and after the update.
GPU: Gigabyte R9 270OC with stock clocks