This project is put into maintanance mode. No new features will be added and only really critical bugs will be fixed for now. If you're looking for a tool to work with Mercurial on top of Subversion please refer to hgsubversion, a hg extension that provides a more sophisticated approach.
According to the History page.
The original plan to develop a bulletin board is long dead now and the original name of the software was reused for the team that is working on all these packages. However, recently the Solace project was incorporated which has some forum software elements.