Starting jboss-4.0.2, we have an integrated UDDI v2 compliant UDDI registry included in JBoss. It is Apache juddi that is integrated. We also have a J2EE 1.4 certified JAXR stack in JBoss (also since jboss-4.0.2). So I suggest to leverage these, rather than creating fresh implementations.
We're definitely going to have UDDI support and not implement our own (except where necessary). So jUDDI is something we've been looking at as one of the UDDI implementations, but not necessarily the only one.