Don't know that we have a formal announcement on an MS site yet, but there is some info on the possible issues here: http://myitforum.com/myitforumwp/2013/07/15/configmgr-issues-with-ms13-052-kb2840628/. This affects CM2007 and CM2012.
If you have issues with KB2840628 open a case with Premier Support. And this just reinforces something I preach to my customers all the time: You need a separate test lab that mirrors your production environment and you need to test everything in there (updates, images, packages, etc). And testing in production is not testing 🙂
7/17/2013: Updating entry with official word from product team: http://blogs.technet.com/b/configmgrteam/archive/2013/07/17/issues-reported-with-ms13-052-kb2840628-and-configmgr.aspx