Those customers that have a Volume License Service (VLS) agreement can head over to https://www.microsoft.com/Licensing/servicecenter/Downloads/DownloadsandKeys.aspx and sart getting the bits for System Center 2012 in ISO format downloaded.
Many peolple have been waiting for this, present company included, for the additional support features with Linux and MAC clients and if you pay attention, you will see that there are also client installs for the Endpoint Protection SP1 versions for both Linux and MAC available to download also.
The individual ISOs are grouped under the "System Center 2012 Standard with Service Pack 1" heading. The Endpoint bits alone are under System Center 2012 Endpoint Protection with Service Pack 1."
Happy downloading and installing!