Target date for release 2.4 completion: April 30th.
Very timely, with the Jena User Conference in May.
The main new feature seems to be support for assembler specifications, which are “RDF descriptions of how to construct a model and its associated resources, such as reasoners, prefix mappings, and initial content.”
This means applications that can work on top of different kinds of RDF models (e.g. RDF browsers, graph visualizers, RDF servers) now get a standardized config file format for setting up the models. This also means someone (I, most likely) will have to write an assembler for D2RQ models.