Depends when you're going into production. There's going to be cosmetic changes when the Public Draft comes out in June. Different injection annotations. Bug fixes and some semantic changes as well. We plan on officially supporting it soon after the Public Draft in June on JBoss 4 platform.
So, if you're going into production this summer, then you can probably expect a mostly stable specification (public drafts rarely change much), a stable JBoss EJB3 product, and professional support from us (as well as training).
we were hoping to go into production earlier than June :-( - small project, but high throughput.
how many more preview releases do you expect between now and June?
What's your feeling for the operational stability of preview 4?