I had quickly tested HVS2008UI on Windows Server 2008 R2 beta OS. I have tested it on both Server Core as well as full OS. And the news is, it just works fine as expected. I have not anticipated any WMI changes in this build. However, I still have to thouroghly test it.
You may want to use the same tool to manage your R2 Server Core installs. Let me know if you find any issues with the tool.