EJB3 invocations from other AS to EAP 5 is supported via IIOP theoretically because it requires use of@RemoteHome annotations and EJB 2.1 business interfaces XD
To use IIOP, the EJB remote interface must extend EJBObject, a remote home that extends EJBHome just like in EJB 2.x. The bean must specify @RemoteHome(RemoteHome.class), and@IIOP(interfaceRepositorySupported=false).
Ask me more about it if you need.
Cheers.