Oracle announced and released an EJB3.0 preview implementation last week at TheServerSide Symposium conference, the first of the ‘big 3’ application server vendors to do so, so far.
Rumour has it that IBM have not even started looking at EJB3.0, apparently saying that it is not a priority for them right now. I find that hard to believe, but with the amount of effort and money invested in their EJB2.x implementations (similarly for BEA), maybe this is understandable. However at some point they will have to board the train – with the vastly simplified programming model I believe EJB3.0 will be adopted very quickly by developers.