There isn't an official roadmap yet.
However, you can view a list of the open issues on JIRA (sorted by priority) or the popular issues (sorted by votes). Or, you can look at the last week activity to get a sense of what people are working on.
The following features are desired or expected, but are not yet underway:
- OWL 2 support in ontology API
- migrate package names from
Patches and other contributions welcome!