The other two options as specified in EJB3 are enhancements.
I see these as pretty high priority so I hope to get onto doing this fairly soon.
I'd like to point out I'm keen to hear views on putting inheritance back into the database via SQL3 Type Inheritance or Postgres Table Inheritance. There is a whitepaper on this, so if you haven't yet had a look at that please do. http://www.avaje.org/typeinheritance.html
For me, the longer term approach should be to put table inheritance into the Database avoiding the limitations and issues that the 3 strategies (as per EJB3 spec) give us.