Revit Architecture 2012 has an update! We’re now at Update 2 and there’s a pretty big enhancement list to this update, from improving stability to fixing API issues. The Autodesk page to download the update is here: http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=16841348
If you have any existing deployment images, you can go to deployment image location where you’ll find a folder called TOOLS. Open that folder and click on the shortcut to CREATE & MODIFY… to add the service pack to your image. As for those workstations with Revit already installed, the only way is to manually install them… unless you have SCCM, which is another beast in itself.