The Microsoft Office Single Image v15.1 OEM Preinstallation Kit (OPK) is a set of tools, documentation, and product files that licensed original equipment manufacturers (OEMs) can use to preload Office 2013 on new computers for distribution to end users.
Coming Soon: Microsoft Office Single Image v15.2 Service Pack 1 (SP1) for Office 2013
Timing for the final SP1 release has not yet been determined. When released, the OEM Preinstallation Kit (OPK) will be renamed Office Single Image v15.2 SP1 OPK. SP1 will include monthly updates from March 2013 to the present, posted here