OS Deployment and patch management has always been big challenge for many admins around the world. Not just the testing, but also to get the customer image patched made many ConfigMgr admins a lot older 
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One of the new features in ConfigMgr 2012 allows you to apply updates to an OS image that’s been imported to the ConfigMgr 2012 library. This feature only supports "Component Based Servicing" (CBS) updates, and can be applied to Windows Vista and above.
To use this feature, navigate to Software Library -> Overview -> Operating Systems –Operating System Images, select the Image that you wish to update, and click Schedule Updates from the ribbon.
Full information, Please read on http://www.ronnipedersen.com/2012/03/configmgr-2012-offline-service-for-os-images/
