Very interesting to see the release of AD Replication Status Tool from a dedicated group of people in MSFT. I had a read of the release on Technet Blog post from Ask the Directory Services Team and probably give it a try tomorrow.
This is a read only tool and comes with a compilation of recommended troubleshooting content for replication error.
Here is the preview screenshot of the tool – http://blogs.technet.com/b/askds/archive/2012/08/23/ad-replication-status-tool-is-live.aspx
Download Link – http://www.microsoft.com/en-us/download/details.aspx?id=30005
• Windows Server 2003
• Windows Server 2003 R2
• Windows Server 2008
• Windows Server 2008 R2
• Windows Server 2012 Release Preview
• .NET Framework 4.0 (you may be prompted to install .NET Framework 3.5.1 first on Windows Server 2008)
• Application must be installed on a domain member machine for monitoring