Version 2.0 of the JMX API is being defined
by JSR 255.
I've written about some of the features in the new API before.
They are trickling into the JDK 7 sources over time, so you can
now play with some shiny new things. Here's a description of what
they are, and how you can even access them from JDK 6 if you are
brave.
As you probably know, the JDK 7...