Angela Cochran has published "Implementing CHORUS: Big Decisions Loom for Publishers" in The Scholarly Kitchen.
Here's an excerpt:
The implementation is not without complications. Publishers need to make some pretty serious decisions on how to proceed. The biggest decision may be exactly what to expose in order to comply with any forthcoming public access mandates. The options are to make the accepted manuscripts (AM) publicly available for papers derived from federal funds or to allow access to the final PDF or version of record (VoR). Either is acceptable under federal requirements.