The project is in a very early Beta stage. It makes perfect sense to me that they wouldn't publish a list of features until they've got a fully working version to release. At the moment they probably don't want casual users stumbling across it and installing it before a stable version is produced.
But you can find out more info in several places, including this forum, the project's blog:
http://blog.openinkpot.org/
...and the Users' Guide:
http://openinkpot.org/wiki/0.2/UsersGuide