wsus 3.0 sp2: windows 8 & 2012 updates
apply the following update to allow a windows 2008 r2 server running wsus 3.0 sp2 to provide windows 8 & 2012 updates:
http://support.microsoft.com/kb/2734608
update 7/23/2014:
installing the above update on the server running wsus 3.0 sp2 will resolve windows server 2012 systems receiving error code 800B0001 when checking for updates