The ArcGIS Data Reviewer extension is managed by the Professional Services department at Esri. As you may have noticed, it is a separate install. Therefore, the service pack for Data Reviewer 10 will be separate from the core ArcGIS service pack. The Professional Services team is dependent on core's release of its service pack. We need to verify that the Data Reviewer service pack fixes work with core's service pack fixes. We may not release on the same day, but it will be close.
There are approximately 120 defects and enhancements that have been addressed for ArcGIS Data Reviewer 10 Service Pack 1.