Well, it looks like I missed the boat on this release of CruiseControl.NET 1.2.x back in January of 07. Oops. It looks like its fairly simple to upgrade, no breaking changes from what I can see.
The new feature that got me excited is that the Subversion provider now supports checking out the source. I had normally solved this by performing an svn-update (or svn-checkout) through the NAnt Contrib tasks. Its nice that I can now have CruiseControl.NET doing this for me instead of my tasks doing it for me.