The ManageIQ Sprint 51 review outlines significant progress made between January 2 and 4, 2017, including 249 pull requests merged across various features, updates on community events, and enhancements in both classic and service UI. Key developments included the creation of new repositories for classic UI and automate content, improvements in the service UI performance, and enhanced API functionalities. The report also mentioned ongoing refactoring efforts and upcoming release plans, indicating a transition to two-week sprint cycles for future reviews.