Achim Hugen is preparing to contribute JMX Support for HiveMind. Looks very much like I had originally envisioned. As with Tapestry, I'm looking forward to a time where I'm not the one doing the most interesting work.
Additionally, James Carman has spun up and started checking in code; he's added support for AOP Alliance style interceptors. He's also written an article on HiveMind for TheServerSide.com which should be up soon.