There was a talk about this on the Decentralized Web Summit. Unfortunately the (livestreaming) version uploaded to Youtube is (still) borked, but they have reuploaded the videos to the IA directly: https://archive.org/details/decentralizedwebsummitmedia-2018... (from 12m00s on).

Would anyone know how they plan to represent Idemix (or U-Prove) keys and proofs, for example for Hyperledger Indy / Sovrin? There doesn't seem to be anything in the w3id.org JSON-LD schemes, and while wading through the mountains of code of Hyperledger Indy I haven't been able to find any interface to DID documents.