It will be available from the System Center Eval Center:

http://technet.microsoft.com/en-us/evalcenter/hh505660.aspx or http://care.dlservice.microsoft.com/dl/download/3/4/C/34C7656A-F89E-473C-8CE0-21DA5DB0717C/configmgr_2012_RC2_ENU_7703.exe