SCOM 2012 R2 UR12 is published
Microsoft has now also update rollup 12 for the System Center Operations Manager 2012 R2 released. The details of the improvements and new requirements can be found in the following KB article: https://support.microsoft.com/en-us/help/3209587/system-center-2012-r2-om-ur12
The download can be done either via the Windows Update mechanism or through the catalog site http://www.catalog.update.microsoft.com/Search.aspx?q=3209587.
In good tradition Kevin Holman has written again a detailed blog article, in which he describes in detail how of the update: https://blogs.technet.microsoft.com/kevinholman/2017/01/30/ur12-for-scom-2012-r2-step-by-step