Oh so if you're working on anything you want to see in the M4-pre1 release...please check it in now (and make sure it works!!!)
The EJB3 mailbox and refactored message stuff probably won't make it for M4-pre1. I've been a bit slow on this. I tied myself into knots at first trying to be too clever with the message refactoring, then spent some time trying understand EJB3 (cool) Annotations (very cool) and Generics (hmmm...). Once I finally thought I had my head screwed on (how wrong I was) I managed to delete all of the new code via an accident with CVS and Eclipses' "Override and Update". So I'm a little behind, but I will get there soon.
Turns out I probably won't do this till Monday....