Now published, in Beta. See http://pigsonthewing.org.uk/orcid-plugin-for-wordpress/ where it is already deployed.

We have some examples, and at least one potential beta tester, at https://www.jiscmail.ac.uk/cgi-bin/webadmin?A1=ind1405&L=psci-com#32

Here's the original proposal: https://core.trac.wordpress.org/ticket/27823