OpenCl 2.1 was released on November 2015 and actual SDK doesn't include it.
From Kronos site: "“AMD is thrilled to see OpenCL™ include a standard intermediate language as a core component. We believe this opens the door for further innovation in high-level programming languages which can fully leverage the compute power of OpenCL capable devices,” says Greg Stoner, senior director at AMD. “We applaud the efforts of both the compute and graphics communities for defining a standard that can support both - this represents real progress for the industry.”
When will be a new SDK?