SAML in PI7.0

Hi PI Experts,

we had a scenario where we need to integrate multiple SAP ECC Systems like R/3 3.1i, 4.7EE & ECC 6.0 using PI7.0. Now the Client need SAML Authentication, will this be achieved?

Can we use SOAP Adapter for this? Will we get WS Adapter in PI 7.0?

Please guide how to use principal propagation in SAP R/3 3.1i & R/3 4.7EE?

Thanks in advance,

Sriram