For Employee Central/Full Cloud HCM model, Dell Boomi AtomSphere is currently the integration platform that is part of SAP's strategy. As Harris points out, SAP HANA Cloud Integration (HCI) may become part of this strategy.
For the Talent Hybrid model (using SAP ERP HCM for core HR and SuccessFactors HCM suite for Talent Management and analytics), the integration platforms that are part of SAP's strategy are SAP NetWeaver Process Integration (PI) and HCI.