There is no specific requirement for the SP's. It is just the new name for "ESD" that used to be there before. There is no inherent difference in content or behaviour.
Also see my blog at http://scn.sap.com/community/sybase-ase-custom-applications/blog/2013/06/02/sybase-ases-version-numbering-goes-the-sap-way
HTH,
Rob V.