Since October 2013, an initial version of the Data Deposit API (SWORDv2-based) is now available and documentation can be found in our Dataverse Network API Guide.
For those interested in trying the Data Deposit API http://dvn-demo.iq.harvard.edu/dvn/ is a good place to test.
In addition to integrating with OJS, the Data Deposit API is now supported by the "dvn" R package. We are also actively working with the Open Science Framework (OSF) to integrate the Dataverse Network with their system via a Dataverse add-on. OSF has already requested additional non-SWORD API features, which we are tracking here.
In other important project news, coding for the OJS plugin is nearing completion and will be ready for beta functionality testing with OJS journals November 2013. If you are interested in participating please contact us.