Recently on the kanbandev Yahoo! group, there were some messages going back and forth between Corey and David on the differences between a retrospective and an operations review.
I think it was decided that the decoupled Operations review is more of a presentation, where the retrospective is a focused discussion. Corey was relating the ops review as multi-team stand up in the large, and then it sounds as if the retrospective would be follow-up work for specific teams.
At any rate, here’s David’s explanation:
Anatomy of an Operations Review
Chapter 14 from Agile Management: Operations Review