This release of JDatePicker was mostly focused on migration of the project from SourceForge.net to GitHub hosting services. SourceForge provided many years of service for which I am grateful, however, new paradigms emerge in open source project management and I am glad the project could migrate to git without too much effort.
Central repository legacy syncs was disabled on 6 August 2012 in an effort to clean up and consolidate the various processes whereby artefacts are deployed to the Central Repository. As a consequence the Central repository deployment was never done for version 1.3.3. The project is now once again setup for easily releasing to the Central repository via Sonatype OSS infrastructure.
Because the domain name has been registered for the project and it no longer uses sourceforge hosting service, with this release the groupid changes from net.sourceforge.jdatepicker to org.jdatepicker.
You may include it as a dependency in your project via maven (groupid: org.jdatepicker, artifactid: jdatepicker, version: 1.3.4)