http://blogs.technet.com/b/configurationmgr/archive/2013/10/28/hotfix-an-update-is-available-that-adds-support-for-windows-8-1-and-windows-server-2012-r2-to-system-center-configuration-manager-2007-service-pack-2.aspx

Limited functionality – but still handy for those that haven’t moved to 2012 or 2012 R2 as yet.