From Identity metasystem whitepaper at MSDN
“Participants in the identity metasystem can include anyone or anything that uses, participates in, or relies upon identities in any way, including, but not limited to existing identity systems, corporate identities, government identities, Liberty federations, operating systems, mobile devices, online services, and smartcards. Again, the possibilities are only limited by innovators' imaginations.”
Identity Metasystem Architectural Diagram

Going by this diagram which is based on WS-Trust as a request/response protocol for security tokens I do not understand how this architecture of Identity metasystem connects different participants as mentioned in statement above.
If I have a Liberty ID-FF or SAML 2.0 enabled IDP which use SAMLRequest and SAMLResponse for security tokens this architecture does not help.
My understanding is that this identity meta system is for service providers, identity providers and client machines (infocard system) which are based on WS-Trust and so saying that other participants such as Liberty could participate in this meta system may not be correct.
If some one could clarify ?