I just came across this whitepaper from the Web Services and Other Distributed Technologies Center on MSDN.  "The Beta 2 release of WinFX includes InfoCard v1.0 as a feature for using digital identities in a user-centric identity framework. Learn how to interoperate with the InfoCard system as either an identity provider or a relying party."  Download the pdf here http://download.microsoft.com/download/6/c/3/6c3c2ba2-e5f0-4fe3-be7f-c5dcb86af6de/infocard-guide-beta2-published.pdf