For updates on status, you can use bug number NIM058231 — Upgrading geodatabases with replicas to version 10 causes synchronization process to fail.
A mandatory software patch is available and should be applied to all ArcGIS 10 clients (ArcGIS Desktop, ArcGIS Engine, ArcGIS Server) and applied to upgrade the Enterprise (ArcSDE) geodatabase before synchronizing or creating replicas in the 10.0 geodatabase. The patch can be downloaded from the following link: http://resources.arcgis.com/content/patches-and-service-packs?fa=viewPatch&PID=66&MetaID=1626.
Mike H., Program Manager
User Advocacy Group, Esri Support Services