This patch will be update via Live Udpate so as an end user you do not have to do anything. You will notice that the management server will start showing 2010 dates..
To verify whether the server has downloaded the updates, look for the following registry keys on the management server.
SEP SBE 12.0 32-bit system
HKLM\SOFTWARE\Symantec\Symantec Endpoint Protection\SPC\PatchSequence
SEP SBE 12.0 64-bit system
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec Endpoint Protection\SPC\PatchSequence
In case the management server does not update and you are unable to locate the registry key, you can see log information in the following file to troubleshoot.
%temp%\SEPMDefUpdater.log
Hope that helps.
Nimesh.