JRebel 4.0-M1 was released. Grab it while it's hot!
The new features include integration with HotSwap, support for anonymous classes and adding new session beans to JBoss 4.2/5.1 and Glassfish 2/3.
For the new features, I would encourage everyone to give it a try! JRebel already provides the integration for JSF (Mojarra), JAX-RS (Jersey), CDI (Weld), and now the support for EJBs is extended! It is possible to create a JavaEE6 app with almost no redeploys already. Things are improving quite fast!