We've been looking forward to ROCm with OpenCL while now it's available in preliminary form with ROCm 1.4. ROCm 1.4 supports OpenCL 2.0 compatible kernel language support with OpenCL 1.2 compatible runtime. Details here.
But keep in mind it's still very early, the range of hardware support is quite limited, etc. Nevertheless, I'll be trying out ROCm 1.4 to see if it's in shape for running my OpenCL benchmarks. Unfortunately the complete v1.4 release notes do not appear to be available yet. Those wanting to try out the official Debian/RPM packages can find the details here.