I've just learned that there's a proposed revision to the EduPerson specification (the basic schema for attributes about people that's used in Shibboleth, for example) which includes ORCID author IDs. The revised specification is at

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<>http://macedir.org/specs/internet2-mace-dir-eduperson-201602-draft-02.html

and is open for comment through February 28.

Clifford Lynch Director, CNI