7.0.x version of JBoss AS are only web profile certified which means that it fully implements only those technologies that are mandated by web profile. The web profile mandates EJB3.1 lite which is a subset of full EJB3 features. For example, EJB3.1 lite does not mandate MDBs or timerservice or EJB2.x beans or even invocation on EJBs from a remote client.
In 7.0.2, we however have implemented MDBs and timerservice in the "everything" distribution (standalone-preview.xml). So 7.0.2 has most of the EJB3 functionality but it's still not complete.
The recently released 7.1.0.Beta1 has support for EJB2.x beans and remote invocations on EJBs. 7.1.0.Final is expected to have the complete Java EE6 full profile features. Check the roadmap in the JIRA https://issues.jboss.org/browse/AS7?selectedTab=com.atlassian.jira.plugin.system.project%3Aroadmap-panel for the timelines.