CU4 for SQL 2008 R2 SP1 has been released which means you can build CM12 now on R2 with no need of that hotfix. Now it’s time to go upgrade SQL in my lab and be done with old SQL 2008 for good!
And R2 comes with Report Builder 3.0. Steve Thompson has an article on how to get that working nicely with CM12. Just a little registry key change.