Calibur RM (Requirements Management) intgrated client, integrated refactoring that communicates with all developers. Built in support for security audits on the code from fortify - could be run automatically.
Built in unit testing support. Supports both NUnit and DUnit. Greater functionality for building tests then previously available. Plus many, many new features.
It looks like alll the productivity features previously available in JBuilder are now in Diamondback. Looks like features are being added to both at the same time.