The features page indicates they're expecting to support multi-master replication "soon". Does it have any basic master-slave replication yet or does it currently not support any form of replication?
The latest version 1.5.7 doesn't support replication. In SVN trunk we implemented RFC 4533 (http://tools.ietf.org/html/rfc4533) as replication protocol, which is also used by OpenLDAP. It will be available with ApacheDS 2.0. Please track the mailing lists to get informed when ApacheDS 2.0 will be released.