Very recently, JIAC 5.2.0 has been released (and shortly thereafter the first bugfix release, 5.2.1). It has been some time since our last release, and next to the usual bugfixes, stability improvements and performance tweaks, we have added a number of new features and modules. For example, it is now possible to use the @Expose annotation to create actions with multiple return values. Also, new modules include a BPMN interpreter agent and a learning semantic service matcher, among others.
Note that in the future, we are planning to change our release procedure: Instead of always releasing the JIAC core components together will all the optional extension modules, individual modules will be released as needed. That means easier (and thus more frequent) releases for those modules that actually see a lot of change, and fewer releases for those that have not been changed in awhile.