A while back I found the release notes for RC2, but no formal announcement about it's release - but I did speculate it would be a few days. It took a little longer, but it has been released. From the updated release notes, it looks like a lot of the work went into stabilization and CCTray.
Both make sense - with release candidates, it's not about new functionality. It's about fixing what's there. The CCTray is an exception - it was completely rewritten, so changes are probably happening based on community feedback.
I never got RC1 running, but who knows. Maybe I'll have the opportunity. Anyone know how many RCs are planned before it hits 1.0 gold?