System Center 2012 Service Pack 1 has hit the GA (General Availability) milestone.
The best place to see what impact this has in new features and fixes will be here:
Can you provide a link to the SP1 download?
The is no SP1 only update package for download. System Center 2012 SP1 media is used to install new deployments, or update existing ones. The media would be obtained the same way you obtain the RTM of System Center 2012. Either by downloading the eval, MSDN, or via your MVLS corporate site.